Dr. Loyle A. (Nemo) Morrison, 86, a former chief economist and director of investigation with the U.S. Tariff Commission, died of a respiratory failure Wednesday at the Manor Care Nursing Home. He lived in Arlington.

Dr. Morrison was born in Ardoch, N.D., and reared in Vancouver, British Columbia. He served with the Canadian Army in France during World War I. He earned bachelor's and his master's degrees at the University of British Columbia. He earned his doctorate in economics at the University of California at Berkeley.

From 1923 until 1933, he taught economics at New York University and at Princeton University in Princeton, N.J.

Dr. Morrison moved to Washington in 1933 when he joined the National Recovery Administration. In 1934, he joined the Tariff Commission as a principal economist. He was promoted to chief economist in 1943. From 1950 until 1958, he was director of investigations.

In 1958, he went to work for the House of Representatives, where he was the staff director of the House subcommittee on foreign trade policy. He retired in 1961.

Dr. Morrison was a member of the U.S. delegation to the 1948 General Agreement on Trade and Tariffs in Geneva. In 1950, he was a member of the U.S. High Commission for Germany as an adviser on the revision of German tariffs.

His wife, Mary Phifer Morrison, died in 1974.

Survivors include two sons, Lawrence A. of Arlington and Robert M. of Hawaii, and five grandchildren.