That's the other problem. Wages are going up. While that's generally good, I now have to compete with Amazon paying you $15/hr to stack boxes in a warehouse. So my weekly payroll is now higher than ever. I just raise my prices to cover - it's my customers paying for it. But even still, you can add that on top of the material prices.
As an aside, this is a smaller scale proof that raising minimum wage just ends you up with a whole lot of nothing.