State whether the following are true or false, and briefly explain why:
a. Companies spend billions of dollars advertising their products on network TV primarily because the texts of their advertisements persuade consumers that the advertised products are of high quality.
b. You may not get the optimal level of advice from a retail shop when you go in to buy a lamp for your bike because of the free-rider problem.
c. If you need a lawyer, and all your legal expenses are covered by insurance, you should always choose the best-dressed lawyer with the most expensive car and the most ostentatiously furnished office.
d. The benefit of searching for a spouse is affected by the size of the community you live in.