The Bitcoin supply started shrinking from the first halving on Nov. 28, 2012, when the Coinbase went from 50 to 25 BTC.
The gold supply has been shrinking in a much more unpredictable way as the search by mining companies for new seams has become harder and harder.
Same for coal, oil and gas.
Finding natural resources is easy to start with, then becomes harder as more is found. Search technology can elongate the tail, but only to a degree.
An interesting thing I learned, ironically from watching a documentary in my suite onboard my latest cruise, was the artificial diamond manufacture now matches the quality of natural diamonds. It is possible to distinguish uncut lab grown diamonds from natural ones, but once they are cut, this becomes impossible.
Apparently there is a crises in the diamond industry right now, where lab diamonds are being inserted into the supply chain, issued with authentication certificates (which are real certificates) and sold into the market as natural diamonds. If you've bought a natural diamond in the last 10 years or so, it is very possible this is a manufactured diamond.
