“The trade of critic, in literature, music, and the drama, is the most degraded of all trades.”

Vol. I, Ch. 1 : A Man of His Day, p. 8
New Grub Street : A Novel (1891)
Context: I am learning my business. Literature nowadays is a trade. Putting aside men of genius, who may succeed by mere cosmic force, your successful man of letters is your skilful tradesman. He thinks first and foremost of the markets; when one kind of goods begins to go off slackly, he is ready with something new and appetising. He knows perfectly all the possible sources of income. Whatever he has to sell he'll get payment for it from all sorts of various quarters; none of your unpractical selling for a lump sum to a middleman who will make six distinct profits.

Introductio ad prudentiam: Part II (1727), Gnomologia (1732)

On how much she loves performing music with her family in “Carly Simon on Trolling Trump With ‘You’re So Vain,’ Lost Mick Jagger Duet” https://www.rollingstone.com/music/music-features/carly-simon-on-trolling-trump-with-youre-so-vain-lost-mick-jagger-duet-118291/ in Rolling Stone (29 Nov 2016)

Source: The Political Economy of International Relations (1987), Chapter Five, The Politics Of International Trade, p. 172

Source: English Bards and Scotch Reviewers (1809), Line 63.

Mainstream human rights into trade agreements and WTO practice – UN expert urges in new report http://www.ohchr.org/EN/NewsEvents/Pages/DisplayNews.aspx?NewsID=20473&LangID=E#sthash.bn9VjkJJ.dpuf.
2016, Mainstream human rights into trade agreements and WTO practice – UN expert urges in new report

Source: A Treatise On Political Economy (Fourth Edition) (1832), Book III, On Consumption, Chapter VI, Section II, p. 429

Source: The Political Economy of International Relations (1987), Chapter Five, The Politics Of International Trade, p. 171

Writing in the Chartist newspaper (1847), in Marx Engels Collected Works Vol 6, pg 290.