True, we are not ensured that whether a person with reservation price p buys a commodity at that price p. It is this definition that we make with reservation price.
However, it is also clear-cut that "按价格p出租的住房数量正好是所持保留价格大于或等于p的人数".
If we could observe that N consumers buy a commodity at the ongoing price p, who would be these N consumers? They must be the ones with reservation price of at least p!
Your claim is absolutely correct, but the statement that "按价格p出租的住房数量正好是所持保留价格大于或等于p的人数" is no dispute.
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