Question

what's concavity of the ppf curve indicate

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Answer 1

Answer:

Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other. There are several types of friction: Dry friction is a force that opposes the relative lateral motion of two solid surfaces in contact.

Explanation:

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Answer 2

Answer:

The shape of a PPF is commonly drawn as concave to the origin to represent increasing opportunity cost with increased output of a good.