ZOPA
When two people are negotiating, they both have an implicit limit on what they're willing to accept. That limit may be a good one or a bad one depending how good your other options are (your "Best Alternative to Negotiated Settlement").
Between those two limits, the worst one person A will accept, and the worst one person B will accept is the range of possible agreements they can come to. In an ideal negotiation, there's a good range which is still very beneficial to both parties, and it's not important exactly where they split the difference, they're both better off.
In a modern society, we rarely actually negotiate -- buying mass produced goods at a fixed price is much more common. So when we do negotiate (a new job, a new house, or a new car), we're often stressed and unsure, and feel like there should be an objective "fair" price we can turn to.
Inequalities of negotiating position
Normally the fair price is "somewhere in the middle". If you're a statesman or a used-car salesman, you may have to spend a lot of effort shifting the potential agreement around within the ZOPA, which is necessary to your job, but ultimately useless to society.
If you're an idealist or a geek, you may avoid thinking about it and hope for the best -- if person A and person B founded google.com together, it would be unfair if one got 99% of the profit and one got 1% of the profit, but they're still millions of times better off than walking away and getting 50% of somethingelse.com.
But the unfairness is sometimes really obvious. The "fair" wage for a job is somewhere between "the minimum people will do it for" and "the most the company can afford to pay". It's not one or the other. But if there's a small number of companies and many potential employees, the company can ignore "what it can afford to pay" and just make the wage the least people will still work for. If there's one national union and a small number of companies, the wage may be "the most the company can afford to pay", or even more.
You can't say "this value is right", but you can often say "this value is wrong", if one party gets almost all the benefit out of the deal.
This is why people who say "if you agreed to something, it was by definition fair" are so tragically wrong. If the bargaining power is approximately equal, fairness will often emerge (sometimes with a helping hand). If the bargaining power is unequal, the result will usually be unfair.
Minimum Wage
This is basically what minimum wage does. People who paid less than minimum wage are typically in a bad bargaining position, so the proportion of the value they bring to the company which is reflected in their salary is prone to being "the least people will accept" and nowhere near "the most the company can afford to pay" (unless, by coincidence, those are identical, but there's no reason they should be).
Theoretically, the minimum wage should restore the equity to a position closer to what the free market would have found if the inequality of bargaining position hadn't distorted it (without waiting until people are desperate enough for general strikes and revolution).
If minimum wage were equal or more than the salary people bring to the business (with a small safety margin), then the naysayers would be right -- companies would literally be unable to afford employees and would shrink or go bust, or abroad, or employ people under the table.
So, the minimum wage should be somewhere in that range. I and many people think it could be higher. Other people think it's already too high. I've heard people describe a minimum wage which is too high, not in money, but in job security, and the bad result was that most people had temporary unofficial jobs outside the regular system. But in order to argue that, I think someone has to point specifically to those sort of problems, not just offer vague platitudes.
When two people are negotiating, they both have an implicit limit on what they're willing to accept. That limit may be a good one or a bad one depending how good your other options are (your "Best Alternative to Negotiated Settlement").
Between those two limits, the worst one person A will accept, and the worst one person B will accept is the range of possible agreements they can come to. In an ideal negotiation, there's a good range which is still very beneficial to both parties, and it's not important exactly where they split the difference, they're both better off.
In a modern society, we rarely actually negotiate -- buying mass produced goods at a fixed price is much more common. So when we do negotiate (a new job, a new house, or a new car), we're often stressed and unsure, and feel like there should be an objective "fair" price we can turn to.
Inequalities of negotiating position
Normally the fair price is "somewhere in the middle". If you're a statesman or a used-car salesman, you may have to spend a lot of effort shifting the potential agreement around within the ZOPA, which is necessary to your job, but ultimately useless to society.
If you're an idealist or a geek, you may avoid thinking about it and hope for the best -- if person A and person B founded google.com together, it would be unfair if one got 99% of the profit and one got 1% of the profit, but they're still millions of times better off than walking away and getting 50% of somethingelse.com.
But the unfairness is sometimes really obvious. The "fair" wage for a job is somewhere between "the minimum people will do it for" and "the most the company can afford to pay". It's not one or the other. But if there's a small number of companies and many potential employees, the company can ignore "what it can afford to pay" and just make the wage the least people will still work for. If there's one national union and a small number of companies, the wage may be "the most the company can afford to pay", or even more.
You can't say "this value is right", but you can often say "this value is wrong", if one party gets almost all the benefit out of the deal.
This is why people who say "if you agreed to something, it was by definition fair" are so tragically wrong. If the bargaining power is approximately equal, fairness will often emerge (sometimes with a helping hand). If the bargaining power is unequal, the result will usually be unfair.
Minimum Wage
This is basically what minimum wage does. People who paid less than minimum wage are typically in a bad bargaining position, so the proportion of the value they bring to the company which is reflected in their salary is prone to being "the least people will accept" and nowhere near "the most the company can afford to pay" (unless, by coincidence, those are identical, but there's no reason they should be).
Theoretically, the minimum wage should restore the equity to a position closer to what the free market would have found if the inequality of bargaining position hadn't distorted it (without waiting until people are desperate enough for general strikes and revolution).
If minimum wage were equal or more than the salary people bring to the business (with a small safety margin), then the naysayers would be right -- companies would literally be unable to afford employees and would shrink or go bust, or abroad, or employ people under the table.
So, the minimum wage should be somewhere in that range. I and many people think it could be higher. Other people think it's already too high. I've heard people describe a minimum wage which is too high, not in money, but in job security, and the bad result was that most people had temporary unofficial jobs outside the regular system. But in order to argue that, I think someone has to point specifically to those sort of problems, not just offer vague platitudes.