The first thing we should be asking is why now in particular, since conditions have not really changed much in the past few months. For example, back in September, there were large uncertainties in the global economy. China’s economic slowdown was causing alarm. Volatility in international capital markets was high. The appreciation of the US dollar was hurting US exports, which could (yet) mean slower US economic growth. That was not the time for the US Federal Reserve to up interest rates. But now it is – and here’s why.