The other analysis that is relevant here is understanding the specialization in the labour market context. It's in two forms. There is what is referred to as “statistical”, which is what you're talking about, which is apples to apples. Then there is “systemic”, which is what Sheila is talking about, at work. If you only look at the one definition or one understanding, you're not likely to see the full picture.
On June 8th, 2017. See this statement in context.