Elzinga's antitrust expertise led the U.S. Supreme Court to its 5–4 decision on June 28, 2007, in Leegin Creative Leather Products, Inc. v. PSKS, Inc. that minimum retail pricing schemes, formerly treated automatically as illegal under the Sherman Antitrust Act, may offer benefits to consumers.
[3] His CV that was filed as an exhibit in the above case lists more than 50 publications on such topics as airline deregulation, cartels, predatory pricing, and even the beer industry.
His co-authored mystery titles are Murder at the Margin (Thomas Norton & Daughters, 1978), The Fatal Equilibrium (The MIT Press, 1985), and A Deadly Indifference (Carrol & Graf, 1995).
[5] Elzinga is active in several Christian ministries, and also makes a point each year of hosting several students at his Charlottesville-area home for Thanksgiving dinners.
In 2009, Elzinga was one of over 200 economists who signed an ad placed in newspapers by the libertarian Cato Institute opposing the Obama Administration's stimulus bill.