The short version
Just 3 companies supply this market — thin enough that a single exit would be felt immediately. The price has jumped 56% in a year, to $0.2706 per mL — sharp rises like this often mean supply is already tightening. Put together: this looks like a healthy supply — the boring kind, which is exactly what you want.
The numbers behind every sentence are on this page below — and the Watch button emails you when any of them move.