This doesn't happen when you're paid subsistence wages, which sweatshop workers are. It's exploitation of the poor, pure and simple - there's no trickle-down economics in play, they just get to stay poor but alive while the goods they make are sold to wealthier countries.
It would be really nice if free markets played out the way free market advocates say they do, but they don't.
> But the way it will play out, means that there's always a gradient of relative "conditions"
Personally, I'd rather we lived in a meritocratic system where hard work and innovation benefits the individual responsible, and everybody earns the value of their work. I don't like the idea of a perpetual underclass based on characteristics unrelated to personal capability, like nationality or race.