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It is not possible to value all labor equally unless exchange rates are forced. Let's say Al wants his house painted. If Joe paints twice as fast as Bob, Al would value a Joe's certificate twice as much as Bob's. Al might give two sacks of potatoes in exchange for Joe's certificate, while only giving one sack of potatoes in exchange for Bob's. Therefore, the labor is not valued equally. Value is a human measure made by humans.
You could try to force an equal level of exchange, by declaring that one hour of labor is equal to one pound of potatoes. What incentive does Joe have to work as efficiently as he does, when he can get the same goods for his services as does Bob? And how would you enforce this? If Al demands two hours of Bob's labor for a sack of potatoes, will jackbooted thugs step in and force him to accept it?
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