Price equals marginal cost
The slope of the firm’s profit function is equal to zero
Marginal revenue equals marginal cost
All of the above
✅ The correct answer is D.
A competitive firm maximizes profit at the output level where Price equals marginal cost, The slope of the firm’s profit function is equal to zero and Marginal revenue equals marginal cost.
A competitive firm maximizes profit at the output level where Price equals marginal cost, The slope of the firm’s profit function is equal to zero and Marginal revenue equals marginal cost.