In the third edition of his Principles of political economy and taxation (1821), Ricardo wrote: ‘The opinion, entertained by the labouring class, that the employment of machinery is frequently detrimental to their interests, is not founded on prejudice and error, but is conformable to the correct principles of political economy’.
5  3 4 5  Peri, G. (2016), Immigrants, Productivity, and Labor Markets in Journal of Economic Perspectives, 30(4). European Commission (2018), Ageing report 2018 - Underlying Assumptions and Projection Methodologies. Ricardo, D. (1821), The Principles of Political Economy & Taxation. London: New York: J.M. Dent; E.P. Dutton, reprinted in 1911.