I was planning to write an article to explain why the HK protestors have a very long shot to “move" the HK dollars and the Linked Exchange Rate System by their teeny tiny deposits. But I found that Professor Lui has explained this issue very well.
Note! The HK Linked Exchange Rate System is a de facto monetary system but not a simple exchange-rater-fixing control. The M0 supply of HK dollars is fully promised by the total amount the US dollar reserves at the ratio of 1:7.8. The fluctuation of the market exchange rate will directly change the quantity of the M0, which means the HK money issuing banks have incentives to buy or sell the currencies and maintain the rate fluctuate in a very narrow range.
The demands for more US dollar will directly shrink the quantity of the HK dollar, and the rising short-term interest rate will accelerate the process. Both will raise the exchange rate of the HK dollar. If every US dollar is taken away, there will be no HK dollars in the market at all. Here comes the problem: what currency a citizen must use to pay her tickets, punishments, taxes, and rents? There are always demands for HK dollars and people who have all US dollars in hands will have to bear the risk of loss. People will be forced to crazily trace the small quantity of the HK dollars.
following is Professor Lui’s statement: