Demand is altered by the supply of a certain product or service in an economy. According to the graphs on pages 50 and 51 of the textbook as supply is increased the demand decreases at a similar rate.
When it comes to baseball cards there are certain old and rare cards that are very difficult to get a hold of. They are very much in high demand and have extremely high values of hundreds of thousands of dollars due to the low supply of them. Certain Honus Wagner baseball cards go for over a hundred thousand dollars mainly because there are only 10 of them in existence. The company that produced them only made a small amount of them increasing the value and demand for these specific cards.
The effects of supply on demand is evident in supply vs demand line graphs. These graphs demonstrate what happens when supply is increased or decreased over a period of time and how it affects demand. Here is a picture of how these graphs work and the effects that supply has on demand: http://www.google.ca/imgres?q=supply+vs+demand&um=1&hl=en&client=firefox-a&sa=N&rls=org.mozilla:en-US:official&biw=1366&bih=525&tbm=isch&tbnid=V62jznZvqEIrTM:&imgrefurl=http://en.wikipedia.org/wiki/Supply_and_demand&docid=IFlvHL8us8hCoM&w=240&h=240&ei=2LJ2Tu-0JcPm0QHbxrHgDQ&zoom=1&iact=hc&vpx=201&vpy=160&dur=2074&hovh=192&hovw=192&tx=131&ty=124&page=1&tbnh=154&tbnw=154&start=0&ndsp=12&ved=1t:429,r:0,s:0
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