"The most valuable of all capital is that invested in human beings"
"Producer's Surplus is a convenient name for the genus of which the rent of land is the leading species."
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Source: Alfred Marshall, Peter Groenewegen (1997). “Collected works”
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"Political Economy or Economics is a study of mankind in the ordinary business of life."
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"In common use almost every word has many shades of meaning, and therefore needs to be interpreted by the context."
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