The diagram illustrates a production possibility curve (PPC) for a country that makes two goods, X and Y. The starting PPC is shown by ST. What effect does an increase in the productivity of workers who produce good X have on the PPC?
- AThe PPC shifts from ST to SV.
- BThe PPC shifts from ST to SW.
- CThe PPC shifts from ST to UT.
- DThe PPC shifts from ST to UW.