Bitcoin

[mr_lebowski]

13. I'm not entirely sure but my understanding is that the number available are self-limiting

for all practical purposes due to the way that the formula for finding new coins gets harder to solve with each one that is found and thus the cost in electricity increases to the point that coin isn't worth what it costs to find it. But then that can be balanced by the open-market value of each coin going up. So basically people start mining again when coin value shoots up in hopes of getting lucky.

But some or all of them may have outright caps as well, not sure on that point.