From a Keynesian perspective, a short-run decrease in investment spending will shift the aggregate

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In the short-run, a decrease in investment spending will reduce aggregate demand. According to Keynesian economics, in the short-run, the economy is demand-driven, and changes in aggregate demand can cause fluctuations in output and employment levels. As investment spending represents a component of aggregate demand, a decrease in investment spending will reduce overall spending in the economy, leading to a leftward shift in the aggregate demand curve.

From a Keynesian Perspective, a Short-Run Decrease in Investment Spending