Induced demand
(重定向自Induced traffic)

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. This phenomenon, called induced traffic, is considered by some to be a contributing factor to urban sprawl.