Shift in Aggregate Demand or Aggregate Supply A decrease in aggregate demand (from AD₁ to AD₂) is automatically resisted by the Bank of Canada if it adopts a zero-inflation target; the money supply must be increased (moving aggregate demand from AD₂ to AD₃) to resist the change in prices. The employment effects of a decrease in aggregate supply (from SRAS₁ to SRAS₂) are accentuated by the Bank of Canada’s attempt to limit price changes.