When does the laffer curve work?

in an economy of pent up demand, lowering taxes for the wealthy provides additional dollars for private sector investing. The investment is multiplied through the economy ultimately creating higher productivity, higher employment, higher wages, and higher total tax revenues as a result. however, in a low demand economy, reducing taxes does not have a multiplier effect because dollars are simply saved and not invested into the economy. search on YouTube for clifcar for more details.