Unions are usually equivalent to non poaching agreements, they set a price and most companies agrees to not pay significantly above that while most workers agre

Unions are usually equivalent to non poaching agreements, they set a price and most companies agrees to not pay significantly above that while most workers agrees to not work if they are paid significantly below that. It ensures that everyone is paid a mediocre salary, so if you want American engineer salaries to look like European ones start a union!