Merchants everywhere do coupons, even in China

While in China the other day, this flyer was handed to me in the street in front of a restaurant. Discount coupons work all over the world. But I still get blank stares by bankers in some countries who insist on telling me that this is a marketing tactic that is only used in rich developed nations, and that in their country, coupons are never used.

Here's another similar post on coupons in Pakistan.