MTR Corp increases Octopus stake
https://www.railwaygazette.com/technology-data-and-business/mtr-corp-increases-octopus-stake/60786.article
One of the ways to expand sales of the Octopus Card is to let more shopping stores deal with Octopus Card. And, though it's impossible in the current situation, it should also be used in Shenzhen and even in Guangdong.
Technological difficulty about difference of currency will be obstacles to realize it.
