Elasticity

With SUV sales up, car sales down, and mileage driven up, the effects of lower gas prices could soon extend to land use, making suburban and exurban commuting more affordable. Economists have a term for these effects: demand response.
6 days ago   The Wall Street Journal - The Outlook
Eric Jaffe reports on new research by urban travel behavior expert Bradley Lane of U. of Texas/El Paso on elasticity of gas prices and bus and rail ridership. Interestingly, rail ridership spiked twice as much as bus ridership when gas prices rose.
Dec 4, 2011   The Atlantic Cities