Melanie is a reporter. She is writing an article on a certain issue. She, however, interviewed only those people who have the same opinion as she does on that particular issue. This is an example of a(n) ________ bias

Assume the economy is in recession and real GDP is below full employment. The marginal propensity to consume (MPC) is 0.50, and the government follows Keynesian economics by using expansionary fiscal policy to increase aggregate demand (total spending). If an increase of $1,000 billion aggregate demand can restore full employment, the government should:

a. increase spending by $250 billion. b. decrease spending by $500 billion. c. increase spending by $1,000 billion. d. increase spending by $500 billion.

Refer to the diagram for a private closed economy. The MPC and MPS are:

A. .6 and .4 respectively.
B.  .7 and .3 respectively.
C.  both .5.
D.  both .7.