What is the fundamental principle that economists use when evaluating the costs and benefits of production?

Question

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Economists use the marginal principle, which states that individuals and firms should only undertake additional activities if the marginal benefits exceed the marginal costs. This means that in evaluating the costs and benefits of production, economists will consider the additional benefits and additional costs of producing one more unit of a good or service.

What Is the Fundamental Principle That Economists Use When Evaluating