As a born and raised American, I associate union pay with tenure (how long you have worked for one company) or flat pay. This sounds okay when productivity doe

As a born and raised American, I associate union pay with tenure (how long you have worked for one company) or flat pay. This sounds okay when productivity does not vary much by employee like factory workers. However, knowledge workers like software developers can very in productivity by orders of magnitude. Companies can therefore pay far more for more productive employees if they can differentiate employee productivity. As someone who has worked with people whom I consider a net negative on our output, A union based pay that brings my income down to the lowest common denominator is the last place I would want to join.