An autonomous increase in money demand, other things equal, shifts the ________ curve to the ________

The above figure shows the demand and cost curves for a firm in monopolistic competition. In the figure, the firm makes an economic profit of

A) $0. B) $20. C) $40. D) $120.

Which of the following is a tax on consumption?

a. A comprehensive general sales tax. b. A comprehensive value-added tax c. An income tax in a world without saving. d. All of the above. e. a and b