Responsive governments have the ability to make laws and decisions that reflect their constituents’ preferences. However, legislators may lack necessary information about constituents’ opinions and may therefore be unable to meet their demands. Researchers measured whether providing targeted information about citizens’ and firms’ preferences to members of the Vietnamese National Assembly (VNA) increased legislators’ responsiveness. VNA delegates who received information about their citizens’ preferences were more prepared and likely to speak in debates; however, delegates did not appear to be responsive to information about local firms’ preferences. In addition, delegates grew more responsive as other delegates received the same information.