@liuyingyun
The only correct principle for classification of predictions is not to make any exclusions, but to strictly distinguish the boundary conditions of each case. Any classification, in fact, is equivalent to a piecewise function, is to determine the number of boundary conditions of this piecewise function clearly.
After the boundary conditions are segmented, it is necessary to determine how to operate once any situation occurs, that is, the operation is also segmented. Then, leave all the circumstances to the market itself, and let the market choose for itself.
——Chang's theory·prediction about the future（Lesson 68）
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