So far, more than 1,600 licensed derivative products have been launched in the domestic market. 

Sales points include official online stores, about 80 retail stores and nearly 200 high-speed trains.

By the end of November 2019, their sales exceeded CNY500 million (£56 million/$72 million/€64 million), according to Beijing 2022 officials, as reported by China Daily. 

Popular products include bags, badges, fashion, sportswear, special-edition beverage cans and containers, stationery and gold bars.

They feature elements relating to ice and snow sports, and include some Chinese characteristics.

Pens made with recycled material like mineral water bottles have proved especially popular with customers. 

Licensed products range from a commemorative envelope priced CNY9.9 (£1.10/$1.40/€1.25) each to handbags, brooches, and gold bars.

A gold bar designed to meet the demand of collectable enthusiasts could cost more than CNY10,000 (£1,100/$1,4000/€1,300) each.

Last year, Beijing launched special jade and golden seals, which sold at CNY880,000 (£98,000/$127,000/€112,000) and CNY198,000 (£22,000/$28,000/€25,000) each, respectively. 

There were 5,000 pieces as part of a limited edition. 

But, by August, the entire stock at a store in Wangfujing Street in Beijing was sold out, according to China Daily.

The mascots, Bing Dwen Dwen, a panda for the Olympic Games, and Shuey Rhon Rhon, a lantern-like cartoon child for the Paralympics, have, as you would expect feature heavily on merchandise. 

A limited edition of 3,000 commemorative pin badges of Bing Dwen Dwen and Shuey Rhon Rhon was designed for the Lantern Festival, the 15th day of the Lunar New Year, which fell on February 8 this year at the height of the coronavirus crisis which started in China and has affected more than 100,000 people there, killing over 4,200. 

Some 300 badges, at CNY66 (£7.40/$9.50/€8.50) a pair, were bought during February, in spite of coronavirus.