Answer Happy

For a monopolist,
the marginal revenue curve lies below the demand curve because
any reduction in price applies to all prior units sold.
total revenue is a straight, upsloping line because a firm's
sales are independent of product price.
the marginal revenue curve always lies above the ATC because any
increase in price applies to all units sold.
the marginal revenue curve is equal to the demand curve because
any reduction in price applies only to the extra unit sold.