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Measuring economic worth over time
The measurement of economic worth over time is the problem of equating past prices, costs, values and proportions of social production to current prices, costs, values and proportions of social production. For a number of reasons the ability to equate any past indicator with a current indicator of worth is theoretically and practically difficult for economists, historians, and political economists. This has led to some questioning of the idea of time series of worth having any meaning. However, the popular demand for measurements of social worth over time have caused the production of a number of series.
==The need to measure worth over time==
People often seek a comparison between the price of an item in the past, and the price of an item today. Over short periods of time, like months, inflation may measure the role an object and its cost played in an economy: the price of fuel may rise or fall over a month. The price of money itself changes over time, as does the availability of goods and services as they move into or out of production. What people choose to consume changes over time. Finally, concepts such as cash money economies may not exist in past periods, nor ideas like wage labour or capital investment. Comparing what someone paid for a good, how much they had to work for that money, what the money was worth, how scarce a particular good was, what role it played in someone's standard of living, what its proportion was as part of social income, and what proportion it was as part of possible social production is a difficult task. This task is made more difficult by conflicting theoretical concepts of worth.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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