Anybody who studied how British dock workers were hired in the late 19th Century could have told you this. Those who fail to study history are doomed to repeat it. Never believe the hype about extreme individualism. You will always certainly make far more money if you team up with others and make your case politically.
You mean if everyone teams up and makes their case politically, we'll all make far more, in real terms? So teaming up increases overall productivity? (Not impossible but would need more evidence than teaming up increasing bargaining power, though of course the latter needs evidence, too as a junior unionized worker doesn't have bargaining power against senior workers whom union arrangements incidentally tend to benef…
http://www.pewresearch.org/fact-tank/2014/10/09/for-most-wor...
(Still don't know how they measure real wages and purchasing power, thirty years ago you couldn't get a smartphone )