In the Keynesian model, which curve is vertical?

A profit-maximizing output for a single-price monopoly is determined by the intersection of the ________ curves and the profit-maximizing price is found on the ________ curve

A) marginal cost and marginal revenue; marginal revenue B) marginal cost and marginal revenue; demand C) total revenue and total cost; total revenue D) marginal cost and average total cost; demand E) demand and supply; supply

Managers of profit centers earn more when their divisions

a. increase their sales and decrease their costs b. decrease their sales and increase their costs c. increase the costs of the components for which they are responsible d. None