Mr. Nigel Nagarajan:

It is a valid point that economic forecasting is an inexact science. In fact, what happens when there are very large turning points in an economy is that the forecasts often miss those turning points. The reasons for this are complex. They are partly due to the fact that forecasts rely on data, and data tells one what happened in the past. In a way, it is a little like trying to drive a car while looking in the rear-view mirror, because all the data is telling one what happened in the past and one is trying to extrapolate.