The present value of $50 to be received next year is $40. The interest rate is

Dorothy lives in a city with high air pollution. Pollution is a bad, but she is able to avoid air pollution by wearing a face mask. Her preferences are given by

U(q1,q2 ) = (q1 - P)2q22 where q1 is the amount of time she spends wearing a mask, P is the amount of pollution and q2 is a composite of other goods (p2 = 1 ). Dorothy must decide how much to wear a mask and how much q2 to purchase. The price of masks is pM. Assume q1* > P when answering this question. a. Derive Dorothy's demand for masks, q1*(p1,Y, P) b. How does the quantity of pollution affect the demand for masks? That is, find q1*/P. c. How does her income influence the quantity of masks she purchases? That is, find q1*/Y. d. What condition must hold for the assumption q1* > P to hold?

A price floor is

a. a legal minimum on the price at which a good can be sold. b. often imposed when sellers of a good are successful in their attempts to convince the government that the market outcome is unfair without a price floor. c. a source of inefficiency in a market. d. All of the above are correct.