Productivity went up
How do you define productivity?
In the context of wages, I define it as revenue production. A low-skilled worker's ability to generate increased revenue over a given period of time - i.e. his productivity - does not magically appear when given higher wages unless there is zero competition for his job.
If there were competition for the low-skilled worker's job, the employer could simply replace him with a higher-skilled worker who is able to generate a higher level of revenue for the same market rate.*
But again, you and I might be defining productivity differently. Hence, my question.
* This, by the way, is why unions rejoice when minimum wages increase. A higher minimum wage cuts the legs out from under low-skilled workers who are willing to work for a lower rate than union members.