If player B destroys his own brakes before the race, and player A sees that, what is player A's best response

What is a necessary condition for sustainable economic growth?

A) Low cost systems of transportation and communication B) Careful economic planning C) Very high interest rates that encourage household saving D) Government monitoring and manipulation of aggregate investment E) All of the above.

A monopolist will not be able to receive a positive economic profit at any price-output combination at which

A) marginal cost is less than average total cost when the monopolist has equated marginal revenue and marginal cost. B) the average total cost curve is everywhere above the demand curve. C) marginal cost is less than average variable cost when the monopolist has equated marginal revenue and marginal cost. D) marginal revenue falls at a faster rate than marginal cost increases.