✔ 最佳答案
Forecast that the macro economic performance involving very massive data and the material, and must utilize in the huge quantity pattern, establishes the pattern each supposition and the operation, these are not the ordinary investor even ordinary securities dealer can do Generally the data is possibly unable to obtain, but must use the supposition, the partial data's possibility development has doubts. The data relates, changes because of the environment and the current situation development, therefore its forecast must comply with the objective environment, but will revise unceasingly