In a market where firms are successful in convincing their customers that their product is different from their competitors' product but otherwise have no barriers to entry would be best characterized by

A rational consumer should not consume more of a good when:

a. total utility is decreasing. b. marginal utility is diminishing. c. both a and b. d. income is decreasing. e. the price is high.

A tax that takes the same percentage of tax from all taxpayers is called a:

A. progressive tax. B. regressive tax. C. flat tax. D. lump-sum tax.