The Sacramento Bee, April 19, 2010 by Kevin Yamamura
http://www.sacbee.com/2010/04/19/2688057/capital-gains-tax-cuts-turns-into.html
“You might get back as much as half the revenue you lose, but I could also argue that you would get back less than that,” Auerbach said. “There is uncertainty over how much you get back, but there is not any convincing evidence you will get it all back.”