None of that is necessary to know unions/monopolies are bad (for some definition of bad). Their impact is well understood. Economics textbooks usually have at l

None of that is necessary to know unions/monopolies are bad (for some definition of bad). Their impact is well understood. Economics textbooks usually have at least one chapter devoted to monopolies - which unions fall under. Whether monopolies are bad or not is somewhat subjective, but the impact of them is not. Most basically, monopolies lead to price increases.