Quote from econometrics:
so any ideas about going long the HKD spot? instead of holding cash of cos.
Interactive Brokers, at least, treats this as essentially the *same thing* as holding cash. Their accounts are inherently multi-currency accounts and you can switch cash around among currencies without using much if any margin.
You can put on a short USD.HKD position of any size.
To the extent you have cash in your account, it will be used to satisfy the position.
To the extent the position you put on exceeds the cash in your account, it is a leveraged forex position that will roll over perpetually and requires small interest payments.
You can specify whether you want it shown to you as a cash conversion or as a forex position, but this is only labeling and has no effect on anything.
I believe that is the correct approach but other brokers may book-keep it differently.
I do have this position on as I also expect a revaluation of HKD against the USD. I have been advocating this trade for a year.
However I do not like the interest costs and am going to take a different approach which I will outline in another post.
It could take years before the revaluation occurs.