For any firm in any market structure, what is a factor's marginal revenue product?
◦ the change in revenue caused by the sale of an additional unit of output
◦ the increase in output resulting from the use of an additional unit of the factor multiplied by the cost of that factor
◦ marginal revenue multiplied by total product
◦ the change in revenue generated by the sale of the product produced by an additional unit of the factor
◦ the average product of the factor multiplied by the price of the output