Keynesian economists believe that
a. prices are very flexible
b. changes in the money supply could cause changes in velocity
c. real GDP is constant in the short run
d. the only motive for demanding money is the transactions demand motive
e. the economy operates at full employment
B
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When the Fed wants to expand the money supply through open market operation, it
a. sells government securities to the Treasury. b. sells government securities to member banks. c. buys government securities from member banks. d. buys government securities from the Treasury.
Suppose the variable 
has been omitted from the following regression equation, 
is the estimator obtained when
src="@@PLUGINFILE@@/ppg__cognero__Ch_03_Multiple_Regression_Analysis_Estimation__media__def961f9-c383-4603-be40-6b7c9396899a.PNG" style="vertical-align:-9px;" height="25px" width="17px" /> is omitted from the equation. The bias in 
is negative if _____.
A. 
>0 and 
and 
are positively correlated
B. 
<0 and 
and 
are positively correlated
C. 
=0 and 
and 
are negatively correlated
D. 
=0 and 
and 
are negatively correlated