12.Perfect complements are associated with _____ indifference curves.

1. U-shaped
2. straight-line
3. convex
4. L-shaped

13.Indifference curves consistent with one good being an economic "neuter" are:

1. convex.
2. straight lines with a slope of -1.
3. straight lines with a slope of 0.
4. L-shaped.

14. At any point on an indifference curve, the slope indicates:

1. the relative price ratio of the two goods.
2. the allocation of the consumer's income between the two goods.
3. the marginal rate of substitution between the two goods.
4. how the total satisfaction of the consumer changes with different market baskets.