[10] He served as an expert witness in matters involving antitrust, contract disputes, valuation, damages, and trademark infringement for many years.
He was the chief economic witness for IBM in its antitrust confrontation with the United States Department of Justice, a case the Government dropped in 1982 after 13 years.
[10][11] Fisher died on April 29, 2019, in Belmont, Massachusetts from complications of Alzheimer's disease.
The book is about the antitrust case U.S. vs. IBM, in which Fisher was the lead expert economist for the defense.
[14] He wrote a monograph sponsored by the Econometric Society on the economic theory of general equilibria and disequilibria: Fisher received the John Bates Clark Medal in 1973.