尽量想多算cost也是不对的。
小地主之所以能赚钱,就是放进了劳力。但这劳力不是公司付的。
If so, you have to count everything such as wash cloth, vacuum carpet in you own house and draw a conclusion of not worth holding it.
One this is always true: one has only time as valuable, everything else is the exchange of it. Any gain is a gain when other things can't generate.