XIV. Of Works of Supererogation.
Voluntary Works besides, over and above, God's Commandments, which they call Works of Supererogation,
cannot be taught without arrogancy and impiety: for by them men do declare,
that they do not only render unto God as much as they are bound to do,
but that they do more for his sake, than of bounden duty is required:
whereas Christ saith plainly When ye have done all that are commanded to you,
say, We are unprofitable servants. So, time vs money is a rich persons dilemma.
It's also a monk or nun's dilemma and a motivating factor in ordination for some.
Sounds like they're trying to peg the HKD to the USD Silver Unit[1][2][3].
[1]https://en.wikipedia.org/wiki/Coinage_Act_of_1792#Authorizat... [2]https://silverprice.org/silver-price-per-ounce.html [3]https://en.wikipedia.org/wiki/American_Silver_Eagle
edit: I can't help but notice that 2.5g is the weight in silver of the old Liberty Disme that I pick up for about $1 (paper) when I feel like putting some silver into the local economy (used as 10c). A 'spot' of silver perhaps.