The cost of a benefit or service is ultimately borne by the recipient or the public; there's no such thing as a free lunch.
商家搞的这些优惠活动，看起来很划算，实际上羊毛出在羊身上，最终还是消费者买单。
These promotional offers from businesses seem like a great deal, but in reality, the wool comes from the sheep's back; ultimately, the consumers still pay for it.
Era:
Ancient
Frequency:
Next Idiom