What sort of ecomonic system did critics claim hinders economic growth?
The economic system of communism has faced such criticism. At its basis, communism is about everyone sharing equally in everyone's work. As long as one does a day's work, one receives a share of money and/or food and necessities. The theory seems reasonable, but in reality, workers have little reason to work hard because working harder does not benefit them. This leads to a stifling of creativity and production, which hinder economic growth.
Hope this helps. Good luck!