As a trivial example, severely mentally retarded people are unable to produce almost any value. A surgeon is able to save lives routinely.

Under the conventional economic definition of value, compare how much value is produced e.g. by successful start-up founders compared to a low-IQ guy who is on welfare and will stay there for the rest of his life.

Or, say, compare the value produced by J.K.Rowling to the value produced by an airport TSA agent.