Earlier quoted context omitted.
That same owner could be paying themselves $25 per hour. The average small restaurant owner makes ~$50K per year and has very little line of credit. So unfortunately it's a zero-sum game. Increasing cooks to $20hr means reducing their own comp to $20hr.
It could very well be worse than that. A cultural shift may mean that people collectively decided that they will, for example, spend 8% of their income on eating out rather than 12%. That represents an aggregate decrease in demand and would indicate a negative sum game (something most of HN seems incapable of comprehending)
No, it represents a positive sum game because the job being offered is unsustainable and therefore should be replaced by a more sustainable job.