Sometimes economists disagree because their scientific judgments differ. which of the following instances best reflects this source of disagreement? a. one economist believes the government should tax a household's income; another economist believes the government should tax a household's consumption. b. one economist believes that manufacturing firms should face greater regulation to preserve the environment; another economist believes the government should not intervene in free markets. c. one economist believes that equality should be valued over efficiency in policy decisions; another economist believes that efficiency should be valued over equality in policy decisions. d. one economist believes everyone should pay the same percentage of their income in taxes; another economist believes that wealthier citizens should pay a higher percentage of their income in taxes.