When marginal revenue is zero for a monopolist facing a downward-sloping straight-line demand curve, the price elasticity of demand is:
A. greater than 1.
B. equal to 1.
C. less than 2.
D. equal to 0.

B) equal to 1.

Explanation:

A monopolist as well as every single company, can only make profits when its marginal revenue is positive. If the marginal revenue is zero, that means that the firm is not earning any money by selling that unit.

When the demand for a monopoly's product is elastic, then marginal revenue is positive. When the demand for a monopoly's product is inelastic, then marginal revenue is negative. When the demand for a monopoly's product is unit elastic (equal to 1), then marginal revenue is zero.

the correct answer is economics is a game without winners or losers.

unlike sports or games economic is a game without losers or winner rather it is a game where everyone wins. parties of business doing businesses exchange money with each other and hence exchange is done on the basis of goods. one party takes the goods and other sales it so there is winner on both sides. each party values more highly the good it gets than the good it gives up. both sides exchange only because both intend to increase their value. so there is no concept of lose or win.