Well, I would say information differentials + a huge power imbalance. And I would add to that a huge cultural shift vs. decades ago in terms of what is conside

Well, I would say information differentials + a huge power imbalance. And I would add to that a huge cultural shift vs. decades ago in terms of what is considered "acceptable" and "moral" as relates to relative compensation of rank-and-file workers vs. executives. (One can debate the extent to which these cultural shifts are also the result of policy shifts.)