Typically, the short-run marginal product curve for an input used in production: A. increases initially, reaches a peak, and then declines. B. increases proportionately to output. C. decreases proportionately to output.
The marginal product curve for an input typically increases initially, reaches a peak at some point, and then decreases (marginal cost increases) as additional units of the input are used, holding the quantities of other factors constant.
