The heart of Keynesianism is that the government should ______.

a. run deficits during recessions and surpluses when the economy is doing well
b. run surpluses during recessions and deficits when the economy is doing well
c. run surpluses all the time
d. run deficits all the time
e. control the economy by manipulating interest rates

a. run deficits during recessions and surpluses when the economy is doing well