21 Note that the Environmental Economics Advisory Committee ( EEAC ) of the SAB advised EPA to adjust WTP for increases in real income over time , but not to adjust WTP to account for cross-sectional income differences because of the sensitivity of making such distinctions , and because of insufficient evidence available at present ( EPA-SAB-EEAC-00-013 ) .
Investigating the WTP was a time consuming task for the EEAC .