"Answer"
Production possibility frontiers can shift inwards or outwards.
"Explanation"
An outward shift of the PPF implies an increase in the output of both goods, x and y, in the economy. The longrun outward expansion of the PPF signifies economic development and major drivers are discovery of new resources, technical innovation, improvement in labour skills, investment in human resources, and more.
Thus the production possibility frontier can shift both inwards and outwards. An inward shift is negative and is consistent with economic decline whereas an outward shift is positive and consistent with economic growth.
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