There is a deviation between economic forecast and reality. Why do you do this?

In philosophical terms, it is a common problem of human beings. In the world, we know that human beings are looking forward to tomorrow all the time, which produces all kinds of predictions, conjectures, ideas and so on. In the past, science was not developed, data was not easy to flow out, and human predictions were limited. Most kinds of economic development depend on our own experience. Therefore, when we look back at the era of 1800- 1970, we can imagine the scale and scope of the family intelligence network that has survived to this day. Moreover, in today's era of big data, the accuracy of prediction will be greatly improved. The current economic forecast has gradually formed a perfect system and has a scientific basis. Prediction is not just lip service, but thinking about it in your mind is the real thing. It depends to a great extent on the skills of the forecaster in making assumptions, choosing methods and using information, as well as his ability to make judgments by using his own knowledge, experience and information.