Dinosaurs Extinction Essay Example | Topics and Well Written Essays - 1500 words

Dinosaurs Extinction - Essay Example Variations in the time range of activities often render the theory somewhat problematic. However, the theory provides some important insights that attend to issues relating to meteorite activity in relation to the extinction of the dinosaurs. The explanation weaves into other scientific explanations such as the Darwinian Theory of survival for the fittest in order to expand the understanding of the nature of impact as it affected the survival of various animal species following the massive disruption of the food chain (Michael 1). In this regard, the weight of this theory could be assessed from the perspective of some of the issues that attend to the relationship between organisms and nature. This study assigned significant focus on the theory of volcanism in order to provide alternative points of view to the causal relationship between the theory and the other attendant factors that affected species in various ways.The theory of volcanism is based on the relationship between climate change and the extinction of species. In general, terms the volcanic activities that happened within the Cretaceous period in regions of western India. According to those who hold onto the theory of volcanism, the heavy volcanic activities resulted in the emission of massive amounts of sulfur and carbon dioxide into the atmosphere. Therefore, processes such as photosynthesis were significantly affected (Michael 2). The result was a shortage of food that led to the extinction of vulnerable species such as dinosaurs.... In this regard, the weight of this theory could be assessed from the perspective of some of the issues that attend to the relationship between organisms and nature. This study assigned significant focus on the theory of volcanism in order to provide alternative points of view to the causal relationship between the theory and the other attendant factors that affected species in various ways. The theory of volcanism is based on the relationship between climate change and the extinction of species. In general, terms the volcanic activities that happened within the Cretaceous period in regions of western India. According to those who hold onto the theory of volcanism, the heavy volcanic activities resulted in the emission of massive amounts of sulfur and carbon dioxide into the atmosphere. Therefore, processes such as photosynthesis were significantly affected (Michael 2). The result was shortage of food that led to the extinction of vulnerable species such as dinosaurs. However, the stu dy points out one challenge that relates to the difficulty in pinpointing the exact point in time when these volcanic activities took place. The concerns raised in the study are consistent with other refutations that have established a problematic relationship between the action and consequence of the activity. Fastovan and Sheekan (4) study the extinction of the dinosaurs with special focus on North America. The two authors argued that the event took place in an instantaneous fashion. This study explores multiple other perspectives that attempt to situate the dinosaur extinction phenomenon within definite geographical and historical setting. Fastovan and Sheekan

A journal Article Review of Children of Lesbian and Gay parents Essay

A journal Article Review of Children of Lesbian and Gay parents - Essay Example One major aspect concerning gay and lesbian families is the diversity of the family structure as apart from the couple other people might also be involved in the family structure if in case the couple decide to conceive a child using a donor sperm or a surrogate mother in case of lesbians and gays respectively. In some cases, heterosexual couples after having children might undergo a change in sexual preferences that might result in divorce and eventual legal problems about the custody of the children. Legal problems are also encountered when gay or lesbian couples who have adopted children decide to separate. To begin with, there is considerable variation among various states across the world in recognizing marriage between the same sexes. While a mere 5 states in the US legally recognize same-sex marriages, many other states recognize such marriages conducted in other states or offer limited recognition or do not support them at all. While there are civil unions for these couples i n certain states, they are denied of any kind of federal benefits. In most cases people who argue against legalization of same-sex marriages cite child rearing as a major reason. However laws have been more kind on the children of gay and lesbian parents as they are eligible for health care and insurance and would be protected by law if their parents are married legally. The legal issues surrounding the custody of children and visitation by such parents have also come under scrutiny citing reasons such as the parent’s relationship with a same-sex individual may have adverse effects on the mind of the children. The court rulings in this aspect in several states is divided as some courts have ruled a favorable opinion while others have maintained that individuals with same-sex partners would not make a good parent as it might have a bad influence on the child. While legal issues still loom large with respect to lesbians and gay people taking custody of their own children, laws

Social Media for PR: Implications and Opportunities

Social Media for PR: Implications and Opportunities Mandy Soh The Role and Implications of New Media for PR Introduction With the introduction of the internet comes new media, which in recent years have seen PR practitioners having to adapt and change their approach to cater to the online community. According to Dewdney Ride, new media can be described as â€Å"the preferred term for a range of media practices that employ digital technologies and the computer in some way or another (James, n.d.). New media also provides a wider reach than traditional media, being portable and easily accessible. This essay seeks to explore the opportunities and threats presented to PR practitioners with the introduction of new media. Using a local case study, this essay will also discuss how new media has changed the way PR practitioners engage with their organizational stakeholders, as well as how it has impacted public relations practices today. Case Study – SMRT In 2011, SMRT trains experienced periodical breakdowns during the months October through December. The most prominent incidents being the December 15 and 17 breakdowns, believed to have been the worst train breakdowns in 24 years of operations, sparking angry netizens to take to social media platforms such as Twitter to express their outrage over the unreliability of the train service (Low, 2011). These breakdowns affected some 5,000 commuters during the evening peak hour (Sim, 2011). Netizens were further enraged by the surfacing of a photo on Twitter depicting a photo taken on an SMRT taxi which shows the message starting with â€Å"Income opportunity† before explaining the breakdown (Barimen, 2011). Prior to the episodes, an announcement was made by SMRT to increase train fares starting the following year. This fostered a sour attitude towards SMRT among Singaporeans, and negative comments were buzzing around the various social media sites. Impact of New Media on SMRT’s PR Practice Throughout these incidents, SMRT continued to disregard feedback on their official Facebook and Twitter pages, instead going on to offer vouchers to its subscribers and followers. The only â€Å"official† responses to confused commuters among the chaos seem to be coming from only one SMRT Ltd Feedback, a troll account which emerged during the crisis. Without any clear answers on SMRT’s official channels, the comments from the troll account only further added to the public’s confusion and doubt. Only after 15 hours have elapsed has SMRT began providing information and responding to the situation. The organization, in its failure to communicate timely with the public in times of crisis, has lost their trust. This is despite the fact that there have been no major episodes in their history of operation. The incident has shown that organizations should have a tested plan in place to be able to communicate with the stakeholders efficiently in times like this. Because of the fast transfer of information in the age of new media, employees who manage the social media platforms have to exercise discretion on the appropriate times to put up certain content. In the case of SMRT, instead of responding to queries during the crisis, employees instead put up voucher offers, which was of no help clearing the air of doubts. Opportunities for Better Engagement with Stakeholders Despite the negative impact that new media has on public relations practices, it has also presented a series of opportunities for PR practitioners. Because of its wide reach, organizations can now use new media to launch a direct dialog with their stakeholders with ease. Platforms such as forums and blogs allow for PR practitioners to establish a two-way communication, allowing them to better understand the feedback of the public. When the public is engaged in this process, it creates brand awareness and a word-of-mouth effect. It is also easier for the organization to rally support from the public, by empowering them to make certain decisions. This will result in a higher number of people who would champion the organization’s cause. When there is a need for fast transfer of information, like in times of crisis, organizations can harness the use of new media to get their messages out. This allows for control of the situation on the organization’s part. The organization can even garner the public’s comments and come up with better solutions to solve the problem. Social media sites such as YouTube and Facebook can also be used as publicity vehicles. One such example is from Coca-Cola, which in 2012 released a YouTube video titled â€Å"Hug Me by Coca-Cola†. In the video, several Singaporeans can be seen obtaining a bottle of Coca-Cola from a vending machine. Instead of the traditional vending machine which dispenses with the slotting of coins, this particular machine dispenses upon a hug to it. The video generated more than a million views, with many netizens praising the organization’s creativity. Threats to PR Practices In spite of the opportunities for PR practitioners to effectively use new media as a source of communication with the public, certain threats are present as well. Janal (1998) argues that â€Å"too many companies go on the web without a set of goals†, suggesting that there are no incentives to move the public to be committed instead of just curious. In such cases, Theaker (2004, p. 264) suggests that PR practitioners work with the marketing department to ensure that sites are tested before they are fully launched, instead of conducting such testing on the public. PR practitioners also have to work harder to keep up with the trends to be able to fully understand the social media lingo. On top of that, they have to be more responsive because of the fast transfer of information with lesser effort. Organizations also have to work harder to establish credibility with the reduction of face-to-face interaction, which may create misunderstandings easily. Conclusion In the age of new media, there are many considerations and skills PR practitioners have to be sensitive to and develop to better reach out to their intended public. However, with proper research and strategizing, new media can be a very powerful tool for PR practitioners. Apart from this, PR practitioners also have to remember that having a better engagement with the public will lead to better reach for the organization. Instead of using new media to generate a large number of likes, genuine engagement of the public will ultimately lead to brand loyalty. The use of new media can be a double-edged sword in cases like SMRT. If PR practitioners are able to be well attuned to the sensitive nature of it however, new media can be effectively used to reach out to a wide number of stakeholders, thereby establishing their organization’s reputation. References Barimen, A. (2011, December 21). Not So SMRT: A Case Study of Communications Failure. Retrieved April 6, 2015, from http://www.skribeproductions.com/2011/12/21/not-so-smrt-a-case-study-of-communications-failure/ James, M. (n.d.). A review of the impact of new media on public relations: Challenges for terrain, practice and education. Asia Pacific Public Relations Journal, 8. Retrieved April 7, 2015, from http://www.academia.edu/1529188/A_review_of_the_impact_of_new_media_on_public_relations_Challenges_for_terrain_practice_and_education Low, I. (2011, December 16). Singapore’s MRT Breakdown Chaos Leaves Thousands Stranded. Straits Times Indonesia. Retrieved April 6, 2015, from http://thejakartaglobe.beritasatu.com/archive/singapores-mrt-breakdown-chaos-leaves-thousands-stranded/485081/ Sim, R. (2011, October 18). In Singapore, 5,000 Commuters Affected by MRT Disruption. Straits Times Indonesia. Retrieved April 6, 2015, from http://thejakartaglobe.beritasatu.com/archive/in-singapore-5000-commuters-affected-by-mrt-disruption/472390/ Theaker, A. (2004). Using the internet effectively in public relations. InThe Public Relations Handbook(2nd ed., p. 264). England, Abingdon, Oxfordshire: Routledge. Malaria: Causes, Prevention and Treatments Malaria: Causes, Prevention and Treatments Introduction There are over 100 species of malaria parasites the most known to cause death is in Africa called plasmodium falciparum (Malaria No More 2014). Only female anopheles mosquitos can transmit malaria (Malaria No More 2014). The malaria parasite is a member of the apicomplexa they are characterized by a set of organelles (Greenwood et al., 2008). These organelles are known as apical organelles because are located at the end of the parasite (Greenwood et al., 2008). This plasmodium parasite has cycles to develop in the mosquito (Greenwood et al., 2008). When this parasite enters the body through the mosquito it invades the liver there it multiplies 10,000 times two weeks in, the parasite goes into the blood stream where it infects the red blood cells (Malaria No More 2014). Currently 1 million people are dying from malaria and 500 million cases (Greenwood et al., 2008). As of now 2 billion are at risk of malaria mostly affecting poor populations around subtropical and tropical areas because the temperature and rain are better for the development of the malaria causing parasites in mosquitos (Greenwood et al., 2008). Malaria is a mosquito borne disease caused by a parasite (Centers for Disease Control and Prevention, 2014). It usually causes chills, muscle pain, fever, and flu like illness (Malaria.com, 2011). It can also cause severe problems such as damage to the brain, heart, kidneys, and lungs (Malaria.com, 2011). When malaria is untreated it develops severe complications and causes death (Malaria.com, 2011). Malaria is caused when a mosquito infected with parasites bites a person (Malaria.com, 2011). In some rare occasions people can get it when they come in contact with infected blood (Malaria.com, 2011). Review and Results of Case Study In this study a 46 year old male was admitted to a hospital in Saudi Arabia (Hussain et al., 2008). 10 days before he was admitted had many symptoms which included abdominal pain, vomiting, and loose stools. He also got bloody diarrhea a day before his admission (Hussain et al., 2008). He didn’t appear to have a fever or cold and flushing of face and his medical history was great (Hussain et al., 2008). Once he was admitted he had a report of his blood film which was negative for malaria parasites (Hussain et al., 2008). His examination showed that he had diffuse congested mucosa of the stomach (Hussain et al., 2008). His blood, urine, and stool culture reports were all negative (Hussain et al., 2008). They did find hematological findings which were anaemia with hemoglobin because of the destruction of the red blood cells (Hussain et al., 2008). He had a slightly impaired renal function but his liver function tests were normal. 5 days after his admission on a routine peripheral smear they reported a sexual form of plasmodium malariae (Hussain et al., 2008). They didn’t know if he had malaria because he had no signs of organ damage and didn’t fulfill the World Health Organization criteria of sever malaria (Hussain et al., 2008). The patient had recent history of travel to Pakistan without taking chemoprophylaxis for malaria since malaria is widely distributed in Pakistan (Hussain et al., 2008). This patient was given drugs and blood to correct anaemia from malaria and gastrointestinal bleeding (Hussain et al., 2008). He was later released four weeks later (Hussain et al., 2008). Analysis Malaria is a parasite called plasmodium malariae which starts of in the mosquito (Collins Jeffery, 2007). The mosquito has a small number of sporozoites that go to the salivary duct it is then injected to the venules of the bitten human (Collins Jeffery, 2007). When the parasite enters the blood stream, within an hour the sporozoites attack’s the liver (Collins Jeffery, 2007). Once inside a parenchymal cell the parasite matures in 15 days (Collins Jeffery, 2007). Within this time period thousands of merozoites are produced. These merozoites invade the red blood cells and start the erythrocytic cycle (Collins Jeffery, 2007). After a developmental cycle happens in the red blood cells, for a couple of days some merozoites are released and reinvade more red blood cells (Collins Jeffery, 2007). While the malaria parasite is multiplying in the red blood cells it has to be moving between cells otherwise it will get cleared out by the immune system (Harvard School of Public Health, 2012). In the parasites nucleus there is a gene called virulence which encodes a protein on the surface of the parasite to allow it to enter the blood cells where it can turn off and on to hide (Harvard School of Public Health, 2012). It is able to turn off the gene by packing the gene up into a tight ball in the nucleus to turn back on it simply unpacks itself from the ball (Harvard School of Public Health, 2012). The parasite forms a protein which binds to a specific antigen called Duffy antigen (GenePlanaet, 2012). This antigen is common in our blood cells this makes a Duffy antigen system which is like the AB0 blood system (GenePlanaet, 2012). People with Duffy positive have these antigens Duffy negative doesn’t (GenePlanaet, 2012). The malaria parasite needs these Duffy proteins to enter the blood stream and develop the infection (GenePlanaet, 2012). People with Duffy negative are resistant to malaria because they don’t have this antigen (GenePlanaet, 2012). Symptoms and Tests There is uncomplicated which last 6-10 hours which has a cold stage a hot stage and a sweating stage (Centers for Disease Control and Prevention, 2014). In a cold stage the person has a sensation of a cold and shivers (Centers for Disease Control and Prevention, 2014). The host stage consists of fever, headaches, vomiting, and seizures in young children (Centers for Disease Control and Prevention, 2014). The sweating stage is when the person sweats and returns to a normal temperature and experience tiredness (Centers for Disease Control and Prevention, 2014). Some symptoms of this are fever, chills, sweat, headache, nausea and vomiting, body aches, and general malaise (Centers for Disease Control and Prevention, 2014). Some physical symptoms may include increased respiratory rate, weakness, elevated temperature, enlarged spleen, enlarged liver and perspiration (Centers for Disease Control and Prevention, 2014). Sever malaria has different results a person might have seizures go into a coma or other neurologic abnormalities (Centers for Disease Control and Prevention, 2014). They can also experience server anemia because of the destruction of their red blood cells. Acute respiratory distress, abnormalities in the blood, low blood pressure, kidney failure, and metabolic acidosis are other results of server malaria (Centers for Disease Control and Prevention, 2014). Tests that were given in this case study were blood smears, endoscopic examination, and abdominal ultrasound. Blood smears are taken from a finger prick (webmed, 2011). When the doctors do blood smear tests they use thick and thin blood smears to know if someone has malaria (webmed, 2011). It will let them know the percentage of red blood cells that are infected with the parasite (webmed, 2011). When they do a thick blood smear a drop of blood is put on a glass slide for examination (webmed, 2011). These tests are more useful to determine the presence of the parasite because they use a larger sample of blood to examine (webmed, 2011). A thin blood smear is a drop of blood that is spread across the slide this helps them know what type of malaria the patient has (webmed, 2011). In this case the blood film came back negative for malaria parasites (Hussain et al., 2008). They performed an endoscopic exam in which they found a diffuse congested mucosa (Hussain et al., 2008). They also did an abdominal ultrasound which came out normal (Hussain et al., 2008). There are other ways to test for malaria for example there are various test kits to detect antigens form malaria parasites these kits are usually used where microscopic diagnosis is not available (Centers for Disease Control and Prevention, 2012). There is also a molecular diagnosis where the parasite nucleic acids are detected through a reaction using polymerase chain (Centers for Disease Control and Prevention, 2012). They can also do a serology test that detects antibodies against malaria parasites (Centers for Disease Control and Prevention, 2012). This test uses indirect immunofluorescence or enzyme linked immunosorbent (Centers for Disease Control and Prevention, 2012). This test does not detect the current infection what it detects is the past exposure (Centers for Disease Control and Prevention, 2012). There are lateral strip tests what these tests allow them to do is to target histidine rich protein 2 of the malaria parasite and its specific lactate dehydrogenase (Kakkilaya, 2011). Theses don’t require any type of machinery so they can be performed anywhere (Kakkilaya, 2011). The kidney and liver are checked to see if they have any damage to see if they have malaria or rule it out. Treatments There are several treatments and that are given to stop the malaria parasite from developing in the blood. Some of them are chloroquine, malaron, lariam, quinine, doxycycline, clindamycin, and quinidine (Centers for Disease Control and Prevention, 2012). Chloroquine helps prevent the malaria parasite to develop in the blood (WebMed, 2014). Cholorquine stops the parasite by blocking the chemical that protects the parasite from haem which is toxic to it (NetDoctor, 2013). This drug is taken orally and it is taken weekly for 4 weeks (NetDoctor, 2013). Malarone stops the parasite from reproducing by blocking an enzyme called dihydrofolate reductase which helps reproduce (NetDoctor, 2013). The dihydrofolate reductase enzyme makes folinic acid from folic acid and this is essential for the parasite to make a new DNA which is needed to reproduce (NetDoctor, 2013). Lariam kills the malaria parasite but it is not understood how it does this (NetDoctor, 2013). This drug is useful for travellers to areas where it is known to be (NetDoctor, 2013). Quinine is used to treat malarial infections it attacks the parasaite once it enters the red blood cells and stops it from multiplying (NetDoctor, 2013). Doxycycline is an antibiotic that stops the parasite (NetDoctor, 2013). It stops it from producing proteins that are needed to stay alive and multiply once it stops it then it is killed by the immune system (NetDoctor, 2013). Quinidine is used for severe cases of malaria it is directly given into a vein for 7 days in a hospital because the person’s heart needs to be monitored (NetDoctor, 2013). In this case the patient was given quinine infusion for 48 hours after the 48 hours he was given 600 mg of quinine orally (Hussain et al., 2008). He was also given some supportive drugs orally for a week which consisted of 500 mg of doxycycline, 40 mg of pantoprazole, and 200 mg of ferrous fumarate for 7 days (Hussain et al., 2008). He was has also given two pints of blood. Four weeks after these drugs were given to him he was discharged from the hospital with a negative blood film for malaria and he did not have any symptoms since his arrival to the clinic (Hussain et al., 2008). He was asked to come back to do further tests to be assured the malaria parasite was gone but he did not return to the clinic (Hussain et al., 2008). Conclusion Malaria can be prevented and if infected it can be treated. It is caused by a parasite that only female mosquitoes can carry. When these mosquitos go and take blood meals they transmit the human it bites. The parasite makes its way to the liver by masking itself from the body so it won’t detect it and eliminate it where later it makes its way to the blood stream and attacks the red blood cells. As of now there are many cases of malaria mostly in the African regions. Although there are treatments for malaria there are still a lot of people who die from it. Children and pregnant women have a higher risk of dying of malaria. Malaria can also be confused with other diseases because the symptoms are similar. This parasite is a very sneaky which likes to hide and wait for a period of time to multiply and prepare to attack the body. Although this might be the case there are plenty of test given to find out if someone has malaria to stop it before it can really do some server damage to the liver. There are some good drugs to help eliminate this parasite from our bodies. Sometimes people might think that this parasite is gone some people that have recovered from the first episode of this illness there might be several attacks called relapses this could happen within a moths or even years of having no symptoms. This usually occurs because they have stage parasites in the liver that reactivate. There are treatments given to reduce the chances of having these relapses. This can be a dangerous disease if not treated on time, but it can be prevented by tests to diagnose it before it is too late.

Discuss the function of the Inspector in An Inspector Calls Essay

Discuss the function of the Inspector in An Inspector Calls John Boynton Priestly in 1945 wrote the play ‘An Inspector Calls’ but set it in 1912. This time difference creates a sense of dramatic irony as the play was written after it was set. The audience would be aware of the events which had taken place between 1912 and 1945, including world war one and two which they would no doubt have experience first hand. ‘An Inspector Calls’ was first performed in Russia, Moscow. This is significant because of the Russian Revolution, which was a system of collective social responsibility where the sate owned everything and used the wealth to look after its citizens. As England was left destroyed due to the world war, therefore there would have been very few playhouses, so Russia had to be alternative for performing the play. The play is set in three scenes. The entire play is set in the dining room of Mr Birling’s house. In contrast this creates claustrophobia and tension as the characters in the play feel as if they are trapped, nowhere to go until the truth is revealed. Although the play is about the death of a young girl called Eva Smith who has committed suicide. Due to this mysterious death, the Birling family has a nasty surprise waiting. The Birling’s are meant to have a high status in their community and they all have done bad things, which has forced a young woman to kill herself. In the play, it reveals what each of them did which leads to Eva Smiths death. As the play concludes we find out that, the inspector has been questioning the Birling family for moral values and their sense of social responsibilities. The inspector is not only a character in the play; he is a dramatic device who has seve... ...w yet, Are you sure you don't know†. J.B Priestly purposely does not use a question mark in this quote to show that the Inspector already knows the answer. This affects the characters as they are firstly surprised on how much knowledge the inspector has and the Birlings cannot give a straight answer. The Inspector knows so much about Eva smith due to finding her diary and some letters. â€Å"I had an idea from something the girl herself wrote". At the start of the play, we are introduced to the Birlings who are no other than an upper class family. The whole family all seem to be living peacefully. Until the moment where it all begins, â€Å"It can’t be any worse for me than it has been. And it might be better† Sheila says. Gerald replies, â€Å"I see†. At this stage the relationship shatters and then from there on the worst is spoken by the inspector to the Birlings.

Through punishments, society is being molded and shaped into what your parents, teachers, and bosses want

Everyday we go out and do the things we do. Everyone lives a different life and sees things differently. But most of the punishments are the same. We behave in certain ways to avoid consequences that authority figures have put out there. Through these punishments, society is being molded and shaped into what your parents, teachers, and bosses want. What your parents, teachers, and bosses want can be exactly what the government wants you to be. The government controls behavior through the punishments it enforces. They set the standards on how people should act and how they should respond to certain situations. If these people act in a way not appropriate to societies standards, then they will be punished. This punishment will try to control the behaviors of these people. It will try to shape the person into what society wants. Punishments are not the only way to control someone's behavior. People use rewards to keep someone happy and to control the behavior. More than likely, if you do something and you get rewarded, you will like it and behave in the same matter again later. I see society as a place where punishments are used more than rewards. They see that punishing an individual is easier than rewarding them. It seems like those that are punished severely and taken to jail, come out of jail and find there way back. This is because some people are punished in the wrong way and sent to jail. Once out of jail, society sees that they have been punished and put them as outcast. These people now have a harder time functioning in society because the government thinks they have changed these individual's behaviors. In reality, they come out of jail with no opportunity available. No one will hire these people because they are now seen as criminals. They try to find jobs but no one reaches out to them because of the punishment they have received. Now these individuals find themselves in a dilemma. They need to eat and feed their families but have no way of doing so. They have to commit crimes to get want they want because society has put them out. Society and the people in it are not perfect and mistakes are made. We use punishment to control behavior so we can predict what they will do and control those around us. We need to understand that punishment can be good if used correctly. But if punishment is used incorrectly, it will hurt society in the long run and make life much harder to live.

Importance of National Income

A variety of measures of national income and output are used in economics to estimate total economic activity in a country or region, including gross domestic product (GDP), gross national product (GNP), net national income (NNI), and adjusted national income (NNI* adjusted for natural resource depletion). All are specially concerned with counting the total amount of goods and services produced within some â€Å"boundary†.The boundary is usually defined by geography or citizenship, and may also restrict the goods and services that are counted. For instance, some measures count only goods and services that are exchanged for money, excluding bartered goods, while other measures may attempt to include bartered goods by imputing monetary values to them. National accounts Main article: National accounts Arriving at a figure for the total production of goods and services in a large region like a country entails a large amount of data-collection and calculation.Although some attempts were made to estimate national incomes as long ago as the 17th century,[2] the systematic keeping of national accounts, of which these figures are a part, only began in the 1930s, in the United States and some European countries. The impetus for that major statistical effort was the Great Depression and the rise of Keynesian economics, which prescribed a greater role for the government in managing an economy, and made it necessary for governments to obtain accurate information so that their interventions into the economy could proceed as well-informed as possible. [edit]Market value Main article: Market value In order to count a good or service, it is necessary to assign value to it. The value that the measures of national income and output assign to a good or service is its market value – the price it fetches when bought or sold. The actual usefulness of a product (its use-value) is not measured – assuming the use-value to be any different from its market value. Thre e strategies have been used to obtain the market values of all the goods and services produced: the product (or output) method, the expenditure method, nd the income method. The product method looks at the economy on an industry-by-industry basis. The total output of the economy is the sum of the outputs of every industry. However, since an output of one industry may be used by another industry and become part of the output of that second industry, to avoid counting the item twice we use not the value output by each industry, but the value-added; that is, the difference between the value of what it puts out and what it takes in. The total value produced by the economy is the sum of the values-added by every industry.The expenditure method is based on the idea that all products are bought by somebody or some organisation. Therefore we sum up the total amount of money people and organisations spend in buying things. This amount must equal the value of everything produced. Usually expe nditures by private individuals, expenditures by businesses, and expenditures by government are calculated separately and then summed to give the total expenditure. Also, a correction term must be introduced to account for imports and exports outside the boundary. The income method works by summing the incomes of all producers within the boundary.Since what they are paid is just the market value of their product, their total income must be the total value of the product. Wages, proprieter's incomes, and corporate profits are the major subdivisions of income. [edit]The output approach The output approach focuses on finding the total output of a nation by directly finding the total value of all goods and services a nation produces. Because of the complication of the multiple stages in the production of a good or service, only the final value of a good or service is included in the total output.This avoids an issue often called ‘double counting', wherein the total value of a good is included several times in national output, by counting it repeatedly in several stages of production. In the example of meat production, the value of the good from the farm may be $10, then $30 from the butchers, and then $60 from the supermarket. The value that should be included in final national output should be $60, not the sum of all those numbers, $90. The values added at each stage of production over the previous stage are respectively $10, $20, and $30.Their sum gives an alternative way of calculating the value of final output. Formulae: GDP(gross domestic product) at market price = value of output in an economy in the particular year – intermediate consumption NNP at factor cost = GDP at market price – depreciation + NFIA (net factor income from abroad) – net indirect taxes[3] [edit]The income approach The income approach equates the total output of a nation to the total factor income received by residents or citizens of the nation.The main types of factor income are: Employee compensation (cost of fringe benefits, including unemployment, health, and retirement benefits); Interest received net of interest paid; Rental income (mainly for the use of real estate) net of expenses of landlords; Royalties paid for the use of intellectual property and extractable natural resources. All remaining value added generated by firms is called the residual or profit. If a firm has stockholders, they own the residual, some of which they receive as dividends. Profit includes the income of the entrepreneur – the businessman who combines factor inputs to produce a good or service.