A large number of short steps might mean a more responsive machine, but it also means a longer wait until getting all the data.
如果采用大量短步骤，那么计算机的响应性更好，但是也意味着要等待更长时间才能得到所有数据。
The empirical data of PPP enigma are that time for mean conversion is long and PPP theory is untenable in short time.
购买力平价假说之谜的实证表象是均值回归时间较长，致使购买力平价理论在短期内不成立。
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