Which of the following taxes is a significant source of revenue for state governments? Select one: O a. General sales tax O b. All of the above c. Corporate income tax O d. Individual income tax A static forecast of the incremental revenue from a tax rate increase presumes that: Select one: O a. The tax base will not change because of the rate increase. O b. The tax base will increase by the same proportion as the rate increase. c. The tax rate and the tax base are correlated. d. The tax base will decrease by the same proportion as the rate increase The enlargement of the tax base is income effect. Select one: O True O False