Vol. 4 of the 33 vol. Collected Works contains a number of Mill’s essays on economic topics, including the collection Essays on Some Unsettled Questions of Political Economy.
The Collected Works of John Stuart Mill, Volume IV - Essays on Economics and Society Part I, ed. John M. Robson, Introduction by Lord Robbins (Toronto: University of Toronto Press, London: Routledge and Kegan Paul, 1967).
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