[mdpopescu]

Two people move their finger forward one centimeter.

One of them made a hole in the ground; he's going to put a seed in it, which will hopefully grow into something useful.

The other one pushed a button which started an automatic lathe which created an engine piston worth a hundred thousand dollars.

The difference in the productivity of two people is practically limitless.

[krapp]

But the second person isn't being productive. The lathe is being productive. In Amazon's case, the person actually pushing the button on the lathe can barely make rent.