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Normative economics (as opposed to positive economics) is a part of economics that expresses value or normative judgments about economic fairness or what the outcome of the economy or goals of public policy ''ought to be''.〔Paul A. Samuelson and William D. Nordhaus (2004). ''Economics'', 18th ed., pp. 5-6 & () Glossary of Terms, "Normative vs. positive economics."〕 Economists commonly prefer to distinguish normative economics ("what ought to be" in economic matters) from positive economics ("what is"). Many normative (value) judgments, however, are held conditionally, to be given up if facts or knowledge of facts changes, so that a change of values may be purely scientific.〔Stanley Wong (1987). "Positive economics," The ''New Palgrave: A Dictionary of Economics'', v. 3, p. 21.〕 On the other hand, welfare economist Amartya Sen distinguishes ''basic (normative) judgments'', which do not depend on such knowledge, from ''nonbasic'' judgments, which do. He finds it interesting to note that "no judgments are demonstrably basic" while some value judgments may be shown to be nonbasic. This leaves open the possibility of fruitful scientific discussion of value judgments.〔Amartya K. Sen (1970), ''Collective Choice and Social Welfare'', pp. 61, 63-64).〕 Positive and normative economics are often synthesized in the style of practical idealism In this discipline, sometimes called the "art of economics," positive economics is utilized as a practical tool for achieving normative objectives. An example of a normative economic statement is as follows: The price of milk should be $6 a gallon to give dairy farmers a higher living standard and to save the family farm. This is a normative statement, because it reflects value judgments. This specific statement makes the judgment that farmers need a higher living standard and that family farms need to be saved.〔 Subfields of normative economics include social choice theory, cooperative game theory, and mechanism design. Some earlier technical problems posed in welfare economics and the theory of justice have been sufficiently addressed as to leave room for consideration of proposals in applied fields such as resource allocation, public policy, social indicators, and inequality and poverty measurement.〔Marc Fleurbaey (2008). "Ethics and economics," ''The New Palgrave Dictionary of Economics''. (Abstract. )〕 == See also == * Distribution (economics) * Is-ought problem * Justice (economics) * Normative science * Positive economics * Social welfare function * Social choice theory * Welfare economics 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Normative economics」の詳細全文を読む スポンサード リンク
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