Economists make a distinction between positive and normative that closely parallels Popper’s line of demarcation, but which is far older. David Hume explained it well in 1739, and Machiavelli used it two centuries earlier, in 1515. A positive statement is a statement about what is and that contains no indication of approval or disapproval. Notice that a positive statement can be wrong. “The moon is made of green cheese” is incorrect, but it is a positive statement because it is a statement about what exists. A normative statement expresses a judgment about whether a situation is desirable or undesirable. “The world would be a better place if the moon were made of green cheese” is a normative statement because it expresses a judgment about what ought to be. Notice that there is no way of disproving this statement. If you disagree with it, you have no sure way of convincing someone who believes the statement that he is wrong.
| tags economics | 06 Oct 2008 | ∞ link comments (view)
