That's all well and good from the consumers point of view. It doesn't help people who are spending their working hours at a place that cannot support them. It's not about doing things less efficiently, so your 'building with shovels' example is facile. The point is that companies alone cannot be entrusted with the welfare of their employees - this is why minimum wage and works rights / entitlements exist in the first place. The concern is that these companies are using loopholes to skirt the laws, to the detriment of citizens.

I'm sure you'd agree that citizens rights should trump those of consumers who want cheap stuff.