Keynesian economics: a. focuses on the long run rather than the short run.
b. stresses the importance of savings to increase investment and long-run aggregate supply.
c. emphasizes that the economy is inherently stable and self-correcting.
d. maintains that prices and wages are fully flexible.
e. focuses on spending, or aggregate demand, as the fundamental factor in the economy.

The correct answer is the option E: focuses on spending, or aggregate demand, as the fundamental factor in the economy.

Explanation:

To begin with, in the economics field the Keynesian theory was developed by John Keynes after the Great Depression in 1929 due to the fact that by then the economics area was conducted by neoliberal economists and it lead to the situation in which they found themself then so Keynes proposed the intervention of the government as more important for the economy and focusing primarily in the spending of this one with the purpose of creating more jobs and therefore the people will increase the demand because they would have money now.

the answer should be demonstrations i hope this