Asupply shock is
a. an increase in potential gdp caused by a government expenditure multiplier, resulting in a leftward shift of the ad curve.
b. an increase in both the inflation and the unemployment rates that may sometimes result in a rightward shift of the sras curve.
c. a sudden increase in the price of an important natural resource, resulting in a leftward shift of the sras curve.
d. an increase in the rate of inflation as a result of expansionary fiscal policy, resulting in a leftward shift of the sras curve.