(a) Supply curve in the short period is inelastic.
(b) The supply is influenced by the increase in the quantity of money.
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This question examines the characteristics of the economy in the Keynesian framework when it reaches full employment.
At full employment, the economy utilizes all available resources efficiently. In the short run, factors like capital stock and the available workforce are fixed. Therefore, increasing output further becomes difficult or impossible without significant price increases. This situation is represented by an inelastic (or vertical) short-run aggregate supply curve. Thus, statement (a) is true.
In the Keynesian model, changes in the money supply primarily influence aggregate demand. While an increase in the money supply can stimulate demand and output when there are unemployed resources, its effect on *supply* at full employment is minimal in the short run. At full employment, the economy's productive capacity is the main constraint. Increasing the money supply further might lead mainly to inflation (a rise in the price level) rather than a significant increase in real output. Hence, the supply is not significantly influenced by the increase in the quantity of money in terms of *output* at full employment. Thus, statement (b) is false.
Based on the analysis, only statement (a) accurately describes the Keynesian framework at full employment.