I guess that is probably what that sentence intends to mean, but it also presumes that all fast food workers are making minimum wage. On first reading, I would

I guess that is probably what that sentence intends to mean, but it also presumes that all fast food workers are making minimum wage. On first reading, I would have presumed that they were talking about two different statistics -- the change in minimum wage and the change in average gross wage, but given the context I presume that is probably not the case.