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Diminishing Returns-Concave from origin

The inevitability of ultimately raising opportunity costs might be employed to explain why: (1) Scarcity is the worsening problem in industrial societies. (2) Production possibilities frontiers are concave from origin. (3) Services cost more than goods absorbing alike resources. (4) Additional units of goods cause reduction in the value of output forgone. (5) Production possibilities frontiers ‘bow in’ towards origin.

Choose the accurate one.

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