The diagram below shows two production possibility frontiers (PPFs) for an economy.
The outward shift of the production possibility frontier from AA AA\,AA to BBBBBB, with increased production of both types of goods at point QQQ, is most likely to be caused by
an increase in the level of net inward migration of skilled labor.
a reduction in the rate of cyclical unemployment.
a reallocation of productive resources from manufacturing to agriculture.
an increase in the central bank's base interest rate.
