Since externalities tend to keep markets from reaching a socially optimal equilibrium, government action
a. will be needed only to correct for positive externalities.
b. is always needed because private solutions can never be attained.
c. is needed when private solutions fail to arise.
d. will be needed only to correct for negative externalities.

the investment was $14,174.196

explanation:

a lump sum means that the father of the example made one deposit and leave it be.

we need to know the value of a capital that generated at 4.05% per year during 28 years the sum of $48,613.24

now clearing the formula to solve for capital we got:

and we reach the answer investment = $14,174.20

1. c

2. b

3. a

4. c

5. a

6. b

7. c

8. c

9.b

10. d

just took it 100%

answer; /// multipotentialite means a person who have many different interests and creative pursuits in life; (one true calling);

polymath; means a person   of wide-ranging knowledge or learning;

scanner; means; a device that captures images from photographic prints,posters,magazine pages.ect;

answer; only identify and interpret trends in the marketplace;