For example, after hot money enters Hong Kong, US dollars can be converted into Hong Kong dollars by the authorities, then sold in the free market, and then bought back at a low price after the depreciation of the Hong Kong dollar to earn the difference.
When hot money leaves Hong Kong, you can use the Hong Kong dollars in your hand to find the authorities to change them into US dollars to leave the country!
Since these river dragons don't have Hong Kong dollars, they borrowed Hong Kong dollars to sell and peddle empty Hong Kong dollars!
Generally speaking, airport currency is sold for all the following acts:
Look for the decline of the Hong Kong dollar, sell it first, wait for the depreciation of the Hong Kong dollar and then buy it back at a low price to earn the difference!