Excess demand is the excess of aggregate demand over and above
its level required to maintain full employment equilibrium in the
economy. Excess demand in an economy causes inflation, that is, rise in
general level of prices. Thus, central bank takes measures to reduce the
credit creation capacity of the commercial banks during inflation. In
turn, the money supply in an economy gets reduced and the inflationary
gap or excess demand gets combated. Therefore, I would advocate contraction of money supply during excess demand.