When economists state that the opportunity cost of a product increases as more of it is produced,what do they mean? For instance,what is the opportunity cost? And,where in a PPF diagram does this statement apply and where does it not apply?

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The Answer of When economists state that the opportunity cost of a product increases as more of it is produced,what do they mean? For instance,what is the opportunity cost? And,where in a PPF diagram does this statement apply and where does it not apply?

When Economists State That the Opportunity Cost of a Product