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In keeping with Locke's theory, can we argue that being an elementary school teacher is work that should be valued less (in terms of money and social value) than being a doctor? Explain.
Yes. Just as it's harder to make wine and find the resources to do so than it is to "make" water, so earning the title of "doctor" is harder to achieve than that of teacher. ALSO, one might find there are far more teachers in society than there are doctors, so by virtue of "supply and demand", teachers are less valuable (to a free market).
(NOTE: There are roughly over 6 million teachers in the USA, and only about 6 hundred thousand doctors. Note, also, that to compare Locke with Plato, Plato would agree the doctor should earn more money, but that they both should be valued equally in terms of social prestige.)