rhythm88

亏1元。。公仔箱論壇; h4 b) n6 j3 [% k* s, \1 h
原本是可以赚三元的，现在利润是两元，所以赚少了1元
. z6 k5 C  ?5 E" U3 ztvb now,tvbnow,bttvbaccounting profit = $2
$ K' Z$ R+ L* |' a4 `0 lbut, economic profit = -$1