ANSWER-
The slope of isoquant is negative because the same level of production occurs when units of one input is increased the units of another input has to be decreased. The slope of isoquant is tangent line this slope is called marginal rate of technical substitution (MRTS). It shows how much capital is to be employed in order to decrease the inputs of labor to maintain the output.
Therefore, The (negative) of the slope at any point along an isoquant is called the marginal rate of technical substitution.
Hence, the answer is option (b) the marginal rate of technical substitution.
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