Geoff has long been one of my favorite economists, and he was perhaps the single most underrated economist around. For all of Geoff’s brilliance, wisdom, and contributions, he never quite made it into mainstream renown (maybe living and teaching in Australia hurt him?).
The three Brennan contributions that have influenced me most are:
1. His account of expressive voting with Loren Lomasky, showing how politics can generate a measured concern that people may not care about all that much. That was also a big influence on Bryan Caplan’s book on voting.
2. His arguments with Jim Buchanan about the limitations of optimal tax theory (Amazon, when I search for this book, why do you summon up as the first pick “Sol de Janeiro Brazilian Bum Bum Body Cream“?). If government policy is misaligned with social welfare, “more efficient” forms of taxation, such as the Ramsey rules, will not in general be more efficient. In particular they can make it too easy for the government to maximize revenue and transfer resources to the public sector. The profession as a whole still refuses to recognize this point, but it should be front and center of most analyses. One side of the coin is that the French government is too large a share of gdp, but it would be interesting to flip the argument and try to apply it to Mexico…
3. Geoff’s book The Economy of Esteem (with Philip Pettit), which analyzed approbational incentives, building upon Adam Smith’s TMS.
Geoff was one of the few scholars comfortable in economics, philosophy, and also political science. Two of his main books, listed above, are co-authored with philosophers. Here is Geoff on scholar.google.com.
Personally, Geoff was popular with just about everybody. He is also one of the few people to have worked with Buchanan and come out of the experience intact. If he was at a conference dinner, he would be sure to find the occasion to sing a song for everybody, and he had a wonderful voice.
Geoff Brennan, we shall miss ye.