And why have companies been making more than ever and consistently growing the last fifty years while wages have been flat? They're competing on a global stage and making massive profits. Why aren't the benefits being felt? A huge piece is less unionization. You can say 'companies didn't have global competition' but that has nothing to do with how the economic gains they made were shaaaared.
Then that global competition emerging didn't force anyone to lower wages--look at Germany. US firms made that decision and kept the extra profits for themselves aaaand workers largerly didn't get that because they weren't organized or on boards like in Germnay as well.