In the one-input model, the cost curve is the inverse of the production frontier if and only if the input price is 1.

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In the one-input model, the cost curve is the inverse of the production frontier if and only if the input price is 1. This is because if the input price is 1, the cost of producing a certain level of output is equal to the amount of input used to produce that level of output. Thus, the cost curve will be the same as the inverse of the production frontier. If the input price is not 1, then the cost curve will be scaled up or down depending on the input price, and will not be the inverse of the production frontier.

In the One-Input Model, the Cost Curve Is the Inverse