It's not just for Islam any more. National Review's Larry Kudlow --
Cutting the fed funds rate "removes a tax on money" that has weakened the economy and the dollar in recent years. This tax on money has also strengthened the gold price, a symbol of higher inflation.
Apparently the right interest rate is zero. As Kudlow says --
It may sound counterintuitive, but it makes perfect sense in the logic of supply-side economics.