Interest Rates
Classical economics posited that interest rates would adjust to equate saving and investment, avoiding a pile-up of inventories (general overproduction). A rise in saving would cause a fall in interest rates, stimulating investment, hence always I=S. But Keynes argued that neither saving nor investment were very responsive to interest rates (i.e., that both were interest inelastic) so that large interest rate changes were needed. Further, it was the demand for and supplies of stocks of money that determined interest rates in the short run. Thus, saving could exceed investment for significant amounts of time, causing a general glut and a recession.
Read more about this topic: Saving
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