More people = more work force + more difficulty to make organized resistance
Maybe I'm being stupid but how do you get that second one?
The "China effect":
When you get enough people, labour becomes very cheap.
It becomes very cheap because of the "supply-demand"; as in there is a lot of supply of work force, while there isnt that much of a demand for it.
And the protection syndicates offered goes to shit, because to have any leverage stemmed from syndicates, there needs to be organization.
In 1910 there were 1,650 million people in the world, 1950 there were 2,521 million; in 2008 there were 6,707 million people.
If im not mistaken, when syndicates were at its most powerful was around 1910 (by regions it varies), while in 1950 they started to decline in their influence power over decisions, while nowadays their power is null compared to those days.
The population from 1910 to 1950 increased 152%, while from 1910 to 2008 is 406%; the more people you need to organize to make a difference, the harder it becomes.
And its even more hard to organize, when people that are uneducated, with the burden of children, because that makes them less prone to look towards the future and more for instant gratification, and sometimes refusing to strike, because that would imply not bringing food to the table of their families when they are already living paycheck to paycheck.