Keynes Thought That the Key to Determining the Broader Economic

Keynes thought that the key to determining the broader economic effects of investment fluctuations

A) was to examine how businesses react to flexible prices and wages.
B) was to closely regulate the real interest rate.
C) was to understand the relationship between how much people earn and their willingness to engage in personal consumption spending.
D) was to understand how changes in the money supply influences consumption decisions.