We could come up with alternatives for small businesses. Small businesses could pay a lower wage, but in return are eligible for 2-5% of profits. Employment at a startup/small business isn't just risky to the investor, it's risky for the employee as well. Doubly so for low wage work where they aren't easily able to save for a period of unemployment.
As with any policy, there's always going to be losers. But we currently have a large pool of people who are currently "losing" in our economy. So while we shouldn't destroy the economy, I also don't think policy should be required to make 100% of current businesses viable. Maybe some businesses just shouldn't be.
Actually I think we are continuing to talk past each other a little. My concern is that an increase in the minimum wage doesn't help people working jobs that don't make big profits for their employers. And this isn't some weird edge case. A LOT of people working for minimum wage or between minimum wage and $15/hour are in jobs that might either stop being economically viable or be automated if their labor because more expensive. A UBI or negative income tax helps all of those people.
Proposing that businesses be allowed to pay employees lower wages than all other businesses as long as the business doesn't make make more than 2-5% profit doesn't change the the fact that a big minimum wage increase helps a subset of workers, is neutral for many others, and hurts a lot of people. It's just shifting people back and forth between the "not helped" and "hurt" categories while creating the potential for additional weird economic distortions as businesses try to manipulate their profit margins.
I guess what I'm having trouble grasping is this. If a worker is making $18,000/year ($9/hour working full time) working at a restaurant that barely breaks even, we can either:
1) Raise the minimum wage to $30,000 ($15/hour), in which case the restaurant either goes under, automates away some of its jobs, or raises prices, which increases profit per worker but reduces the number of customers. In any of the three cases, the worker has a significant risk of losing their job. <-- the worker is harmed, and so is the restaurant owner.
2) Carve out an exception where, because the restaurant isn't turning much of a profit, the restaurant is allowed to keep paying the worker $18,000/year. <-- the worker isn't harmed but also isn't helped.
3) Use tax revenue collected across the economy, including from much more profitable businesses that don't employ minimum wage workers and may even be manufacturing the robots that will ultimately replace the worker to pay the worker $1,000/month ($12,000/year), which, combined with the $18,000 they're already earning, puts them at $30,000/year of total income. <-- the worker is helped, but the restaurant owner isn't harmed.
To me the choice seems obvious if we what to have the biggest impact on reducing the pool of people who are "losing" in our current economy.