Suppose the book-printing industry is competitive and begins in a long-run equilibrium. a. draw a diagram showing the average total cost, marginal cost, marginal revenue, and supply curve of the typical firm in the industry. b. hi-tech printing company invents a new process that sharply reduces the cost of printing books. what happens to hi-tech’s profits and the price of books in the short run when hi-tech’s patent prevents other firms from using the new technology? c. what happens in the long run when the patent expires and other firms are free to use the technology?