In microeconomictheory, the partial equilibriumsupply and demandeconomic model originally developed by Alfred Marshall attempts to describe, explain, and predict changes in the price and quantity of goods sold in competitivemarkets. The model is only a first approximation for describing an imperfectly competitive market. It formalizes the theories used by some economists before Marshall and is one of the most fundamental models of some modern economic schools, widely used as a basic building block in a wide range of more detailed economic models and theories. The theory of supply and demand is important for some economic schools' understanding of a market economy in that it is an explanation of the mechanism by which many resource allocation decisions are made. However, unlike general equilibrium models, supply schedules in this partial equilibrium model are fixed by unexplained forces.
Supply
Supply is the quantity that producers are willing to sell at a given price. For example, the potato grower may be willing to sell 1 million lb of potatoes if the price is $0.75 per lb and substantially more if the market price is $0.90 per lb. The main determinants of supply will be the market price of the good and the cost of producing it. In fact, supply curves are constructed from the firm's long-run cost schedule. Supply curves are traditionally represented as upward-sloping because of the law of diminishing marginal returns. This need not be the case, however, as described below.
US space tourist set for launch Sat, 11 Oct 2008 15:23:32 -0000 US space tourist Richard Garriott will follow in the footsteps of his astronaut father when he blasts off into space on Sunday. Nature loss 'dwarfs bank crisis' Fri, 10 Oct 2008 00:23:07 -0000 The global economy loses more money from deforestation than the current banking crisis, says an EU-commissioned report. Nasa committed to Mars rover plan Sat, 11 Oct 2008 09:26:23 -0000 Nasa pushes ahead with plans to launch its 2009 Mars mission, but acknowledges the need for extra funds to make it happen.
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Bipolar disorder also afflicts children, study finds Sat, 11 Oct 2008 00:00:00 -0700 One key to a proper diagnosis, researchers say, is recognizing grandiose behavior. Their study finds that 44% of those who had manic episodes as children continued having them as adults.
A study of 54 people with bipolar disorder found that the illness, long considered an adult affliction, also affects children.
Asteroid arrival is successfully predicted for first time Sat, 11 Oct 2008 00:00:00 -0700 The object burned up over Sudan, posing no threat to people. The prediction shows that an alert system is working, a Jet Propulsion Laboratory expert says.
Scientists for the first time were able to predict the arrival of an asteroid before it entered Earth's atmosphere.
Fans may prevent SIDS Sat, 11 Oct 2008 00:00:00 -0700 Using a fan to circulate air seemed to lower the risk of sudden infant death syndrome in a study of nearly 500 babies, researchers reported Monday.
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Scientists sequence giant panda's genome: report Sat, 11 Oct 2008 13:55:25 -0400 SHANGHAI (Reuters) - Scientists have sequenced the genome of the giant panda, an achievement which may aid efforts to protect the endangered species, the official Xinhua news agency reported on Saturday.
Russia says Soyuz space landings will be safe Sat, 11 Oct 2008 07:50:21 -0400 BAIKONUR, Kazakhstan (Reuters) - Russian space authorities said on Saturday they had improved safety measures for spaceships returning to Earth from the International Space Station after a series of rough landings.
NASA gives budget-busting Mars probe a reprieve Fri, 10 Oct 2008 18:08:49 -0400 CAPE CANAVERAL, Florida (Reuters) - NASA needs more money to resolve problems with its next Mars mission and keep it on track for launch next year, and is gambling that the U.S. Congress will find the extra funds, officials said on Friday.
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Russian space chief reassures US partners By PETER LEONARD Sat, 11 Oct 2008 15:57:12 -0000 BAIKONUR, Kazakhstan (AP) -- The ongoing global economic turmoil and increasingly strained ties between Moscow and Washington will not stand in the way of further space exploration, Russia's space agency chief said Saturday.... NASA presses ahead for Mars rover launch in 2009 By ALICIA CHANG Fri, 10 Oct 2008 21:54:49 -0000 LOS ANGELES (AP) -- NASA said Friday it will press ahead with plans to launch a supersized rover to Mars next year despite spiraling costs and schedule pressures.... Western group petitions for species protection By SUSAN MONTOYA BRYAN Sat, 11 Oct 2008 14:42:41 -0000 ALBUQUERQUE, N.M. (AP) -- A tortoise, a hare, a mouse and a half-dozen mussels are some of the creatures that a conservation group hopes to save through a "Western Ark" project aimed at petitioning the government for federal protection....
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NOVA scienceNOW: Phoenix Mars Lander NOVA Mon, 28 Jul 2008 13:00:00 -0500 NASA's latest robot has already found frozen water and is looking for more signs that the Red Planet could support life. NOVA scienceNOW: Brain Trauma NOVA Mon, 28 Jul 2008 13:00:00 -0500 Even so-called "mild" head injuries turn out to be anything but. NOVA scienceNOW: Mammoth Mystery NOVA Mon, 28 Jul 2008 13:00:00 -0500 A pair of mammoth skeletons is found locked together by their tusks. What happened?
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New estimates on global warming The global climate could warm by 2.5 degrees F. by the end of the century, even if countries undertake stringent efforts to curb greenhouse-gas emissions, according to a new study from a team of climate scientists in the United States, China, Japan, and five European nations.
This figure is more than ...
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Why people like cars with ‘angry faces’ One of the coolest aspects of the fabric-covered BMW GINA concept car is a little subconscious. I'm sure I was not the only person who felt, at first sight, as though the car were glaring at me. The sharp hood resembles an angry robot staring you down with its icy ...
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Space station crew might not be expanded Sat, 11 Oct 2008 14:21:59 -0400 MOSCOW, Oct. 11 (UPI) -- Plans to add crew members to the International Space Station might be delayed, the head of the Russian space agency Roscosmos said Saturday. Rare black barn owl raised in England Sat, 11 Oct 2008 12:24:00 -0400 LONDON, Oct. 11 (UPI) -- British conservationists say a rare black barn owl must remain in captivity to protect her from attack by her own species. Game developer set for space launch Fri, 10 Oct 2008 22:08:10 -0400 ZHEZKAZGAN, Kazakhstan, Oct. 10 (UPI) -- An Austin, Texas, man in Kazakhstan is set to become the world's sixth space tourist and the first second-generation space traveler from the United States.
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Learn about the equipment you need to clean brass instruments such a trumpet, French horn, trombone and tuba in this free ...