A friend of yours asks you why market prices are better than government-determined prices. What do you say?

a.	because they generally reflect the value of a good to society, but not the cost of making it
b.	because they generally reflect the cost to society of making a good, but not its value
c.	because they generally reflect both the value of a good to society and the cost of making it
d.	because they generally reflect neither the value of a good to society nor the cost of making it