which-of-the-following-scenarios-could-lead-to-an-inward-shift-in-the-ppf

Question

Which of the following scenarios could lead to an inward shift in the PPF?

Accepted Answer

A natural disaster that destroys a significant portion of resources.

Answer

An increase in the labor force due to immigration.

Answer

The discovery of new mineral resources.

Answer

A technological breakthrough in renewable energy.