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老师,asset rebalancing中讲到过:The higher the correlation of the asset class with the rest of the portfolio (a portfolio tends to move with the asset class), less likely that further divergence will happen, therefore the wider the corridor since the allocations tend to stray more slowly from the target. 我当时在群里问过这个问题,老师的解答是如果资产间相关性上升,则偏离target weight可能性越小,因为,就算一个资产涨或跌,另一个资产的value会同向变动,使得总体的weight不会变太多,因此可以考虑更宽的corridor width。我现在复习的时候又有新的疑问:相关性大导致偏离target weight可能性越小,这个我明白。我不明白的是:既然偏离target weight可能性越小,那不是应该缩小corridor吗?因为不太可能偏离target weight,所以rebalancing的可能也不大,从而transaction fee也应该很小,那缩小corridor不是正好合适吗?
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