The chairman of the Council of Economic Advisors under President George W. Bush has weighed in on the destination-based cash-flow tax (DBCFT) at the heart of House Republicans’ tax reform plan. Greg Mankiw wrote on his blog yesterday that the DBCFT is “in effect” a retail sales tax on consumer goods and services that would replace the corporate income tax and finance a reduction to the payroll tax. Mankiw favors the DBCFT.