After the Fed failed to spark any notable increase in aggregate demand despite keeping interest rates at zero for seven years, a group of economists is pressuring the central bank to rethink one of its most closely held-policy parameters. The group of 22 economists, which includes Nobel laureate Joseph Stiglitz and former Minneapolis Fed President Narayana Kocherlakota, delivered a letter to the Fed on Friday pressuring it to appoint a blue-ribbon commission to reevaluate its policy targets in a way that’s transparent and also involves officials with a diversity of viewpoints. Ultimately, the group hopes the central bank will reevaluate its inflation target, which has stood at just below 2% since 2012.