「獨市生意」

(pos:名詞)
<explanation>
yue:只有一個商家做緊嘅某門生意
eng:the only business in the market
<eg>
yue:佢哋做獨市生意，梗係好賺啦。 (keoi5 dei6 zou6 duk6 si5 saang1 ji3, gang2 hai6 hou2 zaan6 laa1.)
eng:They are the only business in town, of course they are very profitable.