Hong Kong supermarkets and super-markets are increasingly offering discounts to customers who pay for a single-use coupon code at checkout.
The change was announced by the Hong Kong Association of Supermarkets and the Association of Woolshippers, which is jointly funded by the government and the retail industry.
The group said shoppers could save $50-$100 on groceries through the code, which has been around since 2014 and is valid for up to five days.
The discount is valid in Hong Kong, China, Singapore and other markets.
A customer can also receive a discount of between 30% and 40% if they have a valid code on file, the group said.
The code can be used for a maximum of six purchases, with discounts up to 50% in some cases.
Woolshippers say they have received hundreds of requests from shoppers for the code.
The code was first introduced in October, but was not formally introduced into the market until March 2018, according to a source in the industry.
Hong Kong’s supermarkets have been among the most aggressive sellers of food in the world, with more than 100 food brands and more than 2,000 grocery stores.
The government has taken steps to boost competition by raising the threshold for buying groceries from HK$1,000 ($970) to HK$3,000, with prices also rising by 25% to 30%.
It also announced a 10-day amnesty for consumers who paid HK$2,000 for a coupon code, with a limit of one coupon code per household.
The new rules, however, will be limited to the shopping malls and shopping districts of the city, where most supermarkets operate.