Every country wants a national airline, and every city wants a glitzy convention center to bring those free-spending conventioneers to town. But the economic analysis doesn’t hold up well in either case. A new book on convention centers should be required reading for any city council thinking of investing the taxpayers’ hard-earned money in another white elephant. This report by Don Bauder in the San Diego Reader is worth quoting at length:

Would you take advice from a gaggle of consultants whose forecasts in the past two decades have been off by 50 percent?

Of course you wouldn’t. But all around the U.S., politicians, civic planners, and particularly business executives have been following the advice of self-professed experts who invariably tell clients to build a convention center or expand an existing one.

A remarkable new book, Convention Center Follies: Politics, Power, and Public Investment in American Cities, published by the University of Pennsylvania Press, tells the amazing story of how one American city after another builds into a massive glut of convention-center space, even though the industry itself warns its centers that the resultant price-slashing will worsen current woes.

The author is Heywood Sanders, the nation’s ranking expert on convention centers, who warned of the billowing glut in a seminal study for the Brookings Institution back in 2005. In this new, heavily footnoted, 514-page book, Sanders, a professor of public administration at the University of Texas/​San Antonio, exhaustively examines consultants’ forecasts in more than 50 cities.

Nashville was told its new center would result in 466,950 hotel room nights; it’s getting around 267,000 — “a little better than half [what was projected],” says Sanders in an interview. Philadelphia isn’t garnering even half the business that was promised.

“Getting half the business [that was projected] is about the norm,” says Sanders. “The actual performance is a fraction of what it is supposed to be.”

Yet, in city after city — including San Diego — self-appointed civic leaders listen to and act on these faulty forecasts. In almost all cases, mainstream media and politicians swallow the predictions whole without checking the consultants’ miserable track records.…

How can convention centers get away with such legerdemain? Those in the know shut up, and the press, politicians, and public have neither the time nor the expertise to follow the prestidigitation.

How do the consultants get away with being 50 percent wrong most of the time? In my opinion — not Sanders’s — consultants in many fields are paid to provide answers that the people paying the consultants’ bills want to hear. And the people paying those bills are the business community — using taxpayers’ money, of course.

The worst news: “These expansions will keep happening,” as long as “you have a mayor who says it is free,” says Sanders.

More, much more, in the Reader and of course in the book. Free-market think tanks have been pointing out the bad economics behind convention centers — and publicly funded stadiums — for many years.