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induced demand
Induced demand, or latent demand, is the phenomenon that after supply increases, more of a good is consumed. This is entirely consistent with the economic theory of supply and demand; however, this idea has become important in the debate over the expansion of transportation systems, and is often used as an argument against widening roads, such as major commuter roads. It is considered by some to be a contributing factor to urban sprawl.
== Effect in transportation systems ==
Latent demand has been recognised by road traffic professionals for many decades. J. J. Leeming, a British road-traffic engineer and county surveyor between 1924 and 1964, described the phenomenon is his 1969 book:
He went on to give an example of the observed effect following the opening of the Doncaster Bypass section of the A1(M) in 1961.
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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