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Says who? Why must everyone both sow and reap? Why can’t one sow and another reap and both be glad together?

Sowing and reaping both imply limited work though.

You want something that involves no work at all?

The opposite. The point I was trying to make was that both the sower and reaper earns the value of his sowing or reaping.

It's not the case that one gets paid for the other working, but both get paid for their level of productivity in whatever system they happen to have a position.

Yes, getting paid specifically for someone else work is unethical. That's not what I'm supporting.