The idea that an improvement in technology causes an increase in population but causes no increase in the average standard of living is attributed to

A textbook publisher is in monopolistic competition. The firm can sell no books at $100 a book, but for each $10 cut in price, the quantity of books it can sell increases by 20 books a day. The firm's total fixed cost is $2,400 a day

Its average variable cost and marginal cost is a constant $20 per book. What is the firm's maximum economic profit? A) zero B) $800 C) -$400 D) $1,000

What does the GDP gap measure?

What will be an ideal response?