In: Economics
a. increase spending by borrowing the money from the central bank.
Or the central bank will buy more government bonds.
b. increase spending = 400/5=$80 billion.
c.the government has to borrow to the public. It will have the
crowding-out effects. Interest rate will rise. The spending is the
same.
d.It might go the classic way such as increase velocity of money,or
adjust wage rate or value of marginal product by raising
productivity. Or it might use only monetary policy, increase money
supply, lower interest rate, lower reserve ratio.That won't affect
the budget deficit.