Friedman (1970)

Friedman, Milton. "The Social Responsibility of Business is to Increase its Profits" New York Times Magazine, September 13, 1970.

LK comment:   In 2000 ethicist William Laufer was preparing for a Wharton-sponsored conference on responsible investment and called Dr. Friedman to consult him on the subject.   According to the book of the conference:

After a pause, Friedman said: “If people want to invest that way, that’s their business. In
most cases such investing is neither harmful nor helpful.”

See also Markowitz  et al (2009).

Link:  https://community-wealth.org/sites/clone.community-wealth.org/files/downloads/report-dunfee.pdf