For all firms, the marginal cost of producing 1 more unit of some good x is $13. All consumers have a marginal valuation of $10 for a unit of x. From an economic efficiency standpoint, PRODUCTION is being carried out ________ and CONSUMPTION is being carried out________.
a) efficiently, inefficiently
b) inefficiently, efficiently
c) efficiently, efficiently
d) inefficiently, inefficiently
****please explain why!! Thanks!! xp