Returns to scale pertains to the impact on output of increasing all inputs simultaneously; diminishing marginal returns pertains to the impact of changing a single input while holding all other inputs constant.

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This is an accurate definition of returns to scale and diminishing marginal returns. Returns to scale and diminishing marginal returns are two distinct concepts that deal with different aspects of production. Returns to scale relate to the impact on output of increasing all inputs proportionally, while diminishing marginal returns relate to the impact on output of increasing one input while holding all others constant.

Returns to Scale Pertains to the Impact on Output of Increasing