Jürg Niehans - A History of Economic Theory
It follows that profit earners, unlike rent and wage earners, have little interest in general economic progress. Though they have more economic understanding than the landowners, they tend to use it not in the general interest but in their particular interests (Smith 1976-83, 2:266f.). Businessmen, therefore, are bad advisers on general welfare.
Niehans, J., 1994. A History of Economic Theory: Classic Contributions 1720 - 1980. London: The Johns Hopkins Press. p.70