Do Changes in Stock Prices Cause Recessions?

The economy and the stock market are closely related. Many people examine the stock market to find out how the economy is doing. It's long been known that if the stock market is in a period of decline, the economy is sure to follow. However there is little evidence that the stock market causes the economy to rise or fall. The stock market does not directly affect the economy. It is simply a mirror of people's generally correct beliefs about what is about to happen in the economy. The best way to understand this is to realize that a stock market index the Dow Jones Industrial Average (DJI) is simply a price. Because the value of index is a price, it only has two determinants: supply and demand.

Supply

Any first year college textbook in Economics states that for most goods if the supply increases in the short run then the price of the good should decline. For example, if the car companies suddenly doubled their supply of cars then we would expect the price of cars to fall.

If we thought that changes in the supply of stocks are the main cause of stock market rises and declines then, according to this rule, when a company issues new stock we would expect the price of stock to decline. If stock prices are largely determined by the supply of stocks and the market declines prior to an economic decline, we should see a flood of new stock issues before a recession. This does not happen in practice, as new stock issues tend to occur as the economy enters a growth period. This is because the money made from a stock issue is used to increase the output of the company, which causes economic growth to rise.

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