Professor Binmore has a monopoly in the market for undergraduate game theory textbooks. The time discounted value of Professor Binmore's future earnings is $2000. Professor Ditt is considering writing a book to compete with Professor Binmore's book. With two books amicably splitting the market, the time discounted value of each professor's future earning would be $200. If there is full information (each professor knows the profits of the other), under what conditions would Professor Binmore deter the entry of Professor Ditt into his market?