Cozy relationships among private interest groups and government officials have stunted economic growth, according to a new report by nonpartisan group of corporate executives who focus on fiscal issues.

In the report, the Committee for Economic Development calls for curbs on the so-called revolving door between Congress and lobbying firms.

The report, titled “Crony Capitalism: Unhealthy Relations Between Business and Government,” says the spiking cost of running campaigns, combined with lobbyists’ mounting influence in Washington, have “exerted an important toll on the U.S. economy.”

“If left unchecked, crony capitalism will continue to sap vitality from the economy,” the report says. “It also will continue to undermine public support for the American model of capitalism. This adds urgency to the task of finding solutions to the rise of crony capitalism.”