The line (frontier) on the production possibilities graph moves to the left most likely because an increased efficiency because of new whoopee cushion technology.
What is Production possibility frontier?
Production possibility frontier refers to an economic curve that illustrates the amounts of two products that can be produced while both of them depend on the exhaustible resources.
Hence, the line (frontier) on the production possibilities graph moves to the left most likely because an increased efficiency because of new whoopee cushion technology.
Therefore, the Option D is correct.
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