having implemented a political serrata, the great council then moved to adopt an economic serrata. the switch toward extractive political institutions was now being followed by a move toward extractive economic institutions. most important, they banned the use of commenda contracts,one of the great institutional innovations that had made venice rich. This shouldn't be a surprise the commenda benefited new merchants, and the established elite was trying to exclude them. This was just one step toward more extractive economic institutions.