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An increase in the marginal propensity to consume from .5 to .7 will cause
a. the ZZ tine to become steeper and a given change in government spending (G) to have a larger effect on output
b. the ZZ line to become steeper and a given change in government spending (G) to have a smaller effect on output
c. the Zz line to become flatter and a given change in government spending (G) to have a smaller effect on output
d. the ZZ line to become flatter and a given change in governmnt spending (G) to have a larger effect on output