质点系所受合外力等于系统总动量的变化率。内力可以改变一个质点的动量，但对系统动量的改变无贡献

来源: marketreflections 于 2010-11-30 13:05:01 [] [博客] [旧帖] [给我悄悄话] 阅读数 : (486 bytes)

质点系所受合外力等于系统总动量的变化率。

内力可以改变一个质点的动量，但对系统动量的改变无贡献


market is efficient, kind of like 内力可以改变一个质点的动量，但对系统动量的改变无贡献, when system risk (outside risk) is minimized;

系统风险 comes from outside, needs to be evaluated everyday, new problem damaging market the most, older information already priced in, and when mkt is slow to react to new info, often meaning new info is FA type, not TA type

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