The money supply decreased and the AD curve shifted to the left.This is consistent with the

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A decrease in the money supply leading to a leftward shift in the Aggregate Demand (AD) curve is consistent with both the Keynesian transmission mechanism (when there is neither a liquidity trap nor interest-insensitive investment) and the monetarist transmission mechanism. Both schools of thought recognize that a reduction in the money supply can decrease aggregate demand, though they explain the process through different mechanisms.

The Money Supply Decreased and the AD Curve Shifted to the Left.This