HKD exchange rate and Hang Seng Index are not correlated
While doing more research on the HK dollar peg, I discovered that the range between 7.75 and 7.85 wasn’t established until May 2005 and that there isn’t much correlation between the stock market and the HKD exchange rate. Even if there was correlation, it might not be too reliable given the short history of the dollar peg range.
The peg to the US dollar was started in 1983. This was the time when the UK started the handover discussion of Hong Kong back to China and people started to worry about the future of Hong Kong. Also it is interesting to note is that the HKD has been steadily depreciating from USD 1 to HKD 5 in the 1970s to USD 1 to HKD 9.6 in 1983. After October 1983, the peg was set at HKD 7.8 to USD 1. This peg lasted for 15 years and then in 1998, the peg was moved to USD 1 to HKD 7.75 and in May 2005, the peg was changed to a range between HKD 7.75 to HKD 7.85.
If you look at the graphs below, after 2005 when the range pegging was introduced, there was only two instances where the exchange rate was hovering around the edge of HKD 7.75 (Late 05-Early 06, and Oct 07). The first time happened during boom time and the second time happened at the start of the stock market correction. So it’s hard to say that there is any correlation between the HKD exchange range and the Hang Seng index.

