The Federal Reserve’s bond-buying may be coming to an end this week, but it is certain to live on for a while as a topic of economic research. Many of the studies of large-scale asset purchases, known as quantitative easing or QE, agree they worked very well to prevent deflation and stabilize the financial system during the 2008 crisis, but disagree about how effective the programs have been in boosting growth since then.

Here is a sample of what some of the most influential experts have said on the issue in recent years.