Another limit to economic prognostication is that we can only analyze data that is right in front of us. Yet many policies and trends can only be evaluated after three or five years, so it is not easy to weigh them into forecasts.
經濟展望的另一個侷限，則是它只擅長分析眼前的變數，但很多政策及趨勢，非得三、五年後才能初步論斷成敗，也不容易在經濟展望中顯示出來。