It is not a correct deduction from the Principles of Economics that enlightened self-interest always operates in the public interest. Nor is it true … - John Maynard Keynes

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It is not a correct deduction from the Principles of Economics that enlightened self-interest always operates in the public interest. Nor is it true that self-interest generally is enlightened; more often individuals acting separately to promote their own ends are too ignorant or too weak to attain even these.