If Adam was there with the Union for 3 more years, then union obviously rewards Adam more than Bob.
The word 'Union' itself means a association of people with a purpose of taking care of each other. You are free to not be a part of such an arrangement. But that doesn't mean that the association is wrong, or its members shouldn't look after each other, or they are wrong to do so.
In fact you are free to do whatever you want, and they are free to what they want. Its just history shows that if you can win big individually(outlier) you are not likely to love unions. But very few people can be outliers so for the bulk of the human race unions work just fine. You tend to do well on the average on the longer run.
The word 'Union' itself means a association of people with a purpose of taking care of each other. You are free to not be a part of such an arrangement. But that doesn't mean that the association is wrong, or its members shouldn't look after each other, or they are wrong to do so.
In fact you are free to do whatever you want, and they are free to what they want. Its just history shows that if you can win big individually(outlier) you are not likely to love unions. But very few people can be outliers so for the bulk of the human race unions work just fine. You tend to do well on the average on the longer run.