At least 3,600 restaurants, stores, supermarkets and hotels across Hong Kong will be offering discounts to celebrate the 75th anniversary of the founding of the People's Republic of China.

Shops taking part in the campaign include supermarkets Wellcome and Parknshop, convenience stores 7-Eleven and CircleK, as well as fast food chains Maxim's and Fairwood.

Also on the list are Ocean Park and leading hotel brands such as Marriott, Nina Hospitality Group and Royal Park Hotels.

A 30 percent discount will apply to specific products or menu items at most participating outlets.

A few restaurants, such as Tai Hing, will go further by slashing 30 percent off the entire bill on National Day.

Catering sector lawmaker Tommy Cheung of the Liberal Party explained it was unreasonable to ask all businesses to offer an across-the-board 30 percent discount.

"If we were to ask everybody participating... to do what Tai Hing is doing now, I think I will probably be left with Tai Hing and a few other outlets that would be willing to do it," he said.

He added he would rather have more shops offering limited discounts, than just a few knocking 30 percent off all every product.

The lawmaker would not estimate the extra revenue to be generated from the campaign, emphasising its intention is to celebrate National Day.