If you grasp this you will be light years ahead of most economists. Bull and bear markets can't exist without the Fed manipulating the money supply. Here's why.
Assume the stock of money is fixed. For example, say there exists only $1 trillion in gold and banks have lent out nine times that amount so that the total money supply of gold plus credit equals $10 trillion because the required bank reserves are 10%. Also assume the population remains constant. If nothing changed, prices would remain the same and the economy would be in a state that economists call equilibrium. Profits would equal the cost of credit, say 5%.
Now we have to look at how many times the $10 trillion is turned over, or changes hands, in order to figure out the total sales for the year. We’ll assume that the turnover, or velocity, of money is five. Then total sales for the year would come to $50 trillion. A profit of 5% would mean $2.5 trillion. Now let’s assume the PE ratio, the measure of risk tolerance, is 15. The market cap would be $37.5 trillion.
With a fixed stock of money, productivity increases at zero and the population remaining constant, the stock market would show the same values every day. Planned investment equals real savings.