| 单词 | constant prices |
| 释义 | constant prices A common set of prices used to value the output of a firm or economy in successive periods. Changes in the real activity of an enterprise or an economy are measured by valuing its real inputs and outputs each year at the same, constant, set of prices. The prices used may be those of some particular date, or average prices over a period. It is difficult to find such a set of constant prices, as the type and quality of goods continually changes. It is impossible to observe the 1990 price of a good not marketed until 2000, or the 2000 price of a good not marketed since 1990. The longer the period covered, the larger is the proportion of total production subject to such difficulties, and the less reliable are comparisons of income or production at constant prices. |
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