Sources and Further Reading:
Testing Marx: Some new results from UK data, Cockshott The historical transience of capital - The downward trend in the rate of profit since XIX century, Esteban Ezequiel Maito Is There a Tendency for the Rate of Profit to Fall? Econometric Evidence for the U.S. Economy, 1948-2007, Basu Is the Theory of a Falling Profit Rate Valid?, Cockshott
http://gesd.free.fr/lietal.pdf
https://trace.tennessee.edu/cgi/viewcontent.cgi?referer=https://en.wikipedia.org/&httpsredir=1&article=1293&context=utk_gradthes
https://journals.sagepub.com/doi/abs/10.1177/0486613412447059
http://gesd.free.fr/mrwrate.pdf
https://thenextrecession.files.wordpress.com/2015/12/revisiting-a-world-rate-of-profit-june-2015.pdf
https://thenextrecession.files.wordpress.com/2015/09/uk-rate-of-profit-august-2015.pdf
https://thenextrecession.files.wordpress.com/2014/04/maito-esteban-the-historical-transience-of-capital-the-downward-tren-in-the-rate-of-profit-since-xix-century.pdf
https://www.youtube.com/watch?v=ypJ_tcnfaWA&ab_channel=PaulCockshott