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There are trillions of transactions going on in this economy. Are you trying to understand it with a simple model? To what ends? So you will know how to advise your rep?
Look at the simple model you have outlined. You said "demand causes prices to rise and this causes inflation". No, inflation is when prices rise (whatever 'prices' are). Second, that is a monetarist explanation of inflation, and for one thing monetarists are evil SOBs from the Chicago school and they hate the working class. (Personally I think the whole 'supply and demand' concept is a crock made up to justify a higher "plus" in prices which are in fact SET by those with power to make their share of the "plus" in cost plus pricing bigger. But that is a whole other story.) Inflation, in today's case, is being driving on the supply side. The supply of oil is deliberately limited by OPEC to maximize their profits. It was not a sudden jump in the demand for oil (at least not in this country) which caused the price to go up. Third, the prime rate does not go up automatically, although there is some question of whether the FED (short for Federal Reserve Board) is setting the market or following the market. The FED deliberately raises rates in order to reduce the supply of money and control the rate of inflation. Fourth, credit is not so much a cost of doing business as it is a cost of expanding business or starting new businesses. Higher rates should slow expansion. It will perhaps have a greater impact on the demand side as many items such as houses, cars, computers, furniture, appliances, big screen TVs are bought on credit. Businesses are more likely to lay people off when demand slacks and they are filling their warehouses. The FED lowers rates when the economy slows in order to encourage business expansion and stimulate demand.
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