Two of Boston’s pro­fes­sional sports teams — the Celtics and the Bruins — have reached the second round of their league play­offs for the third con­sec­u­tive season. We asked John Kwoka, Neal F. Finnegan dis­tin­guished pro­fessor of eco­nomics, if win­ning teams pro­duce wind­falls for sports-​​crazed cities.

How much of an eco­nomic impact can a deep playoff run make on a local economy?
There is no doubt that playoff runs by local teams pro­duce a “feel-​​good moment.” I know, because I am a sports fan. But study after study has shown that post­season play in pro­fes­sional sports has a neg­li­gible impact on local economies. Boston has a gross eco­nomic product of more than $300 bil­lion per year — a bil­lion dol­lars per day. Against that, some added sales of tickets, TV adver­tising and beer simply do not amount to much.

Which sec­tors — the restau­rant, hotel or trans­porta­tion industry, for example — enjoy spikes in busi­ness during a pro­longed playoff surge?
Sports fran­chises and teams that are suc­cessful do what I call “shift and con­cen­trate” local busi­ness. Restau­rants, bars, hotels, air­lines and taxis all ben­efit, but — to the extent that playoff runs just divert people from other activ­i­ties such as watching movies on Net­flix or get­ting actual work done — it’s not likely that there is a net overall eco­nomic gain. 

How does a city mea­sure its eco­nomic suc­cess as a result of its local sports teams?
Sports teams talk up the ben­e­fits in terms of spec­tator atten­dance and spending, but these are pri­vate ben­e­fits cap­tured by pri­vate busi­nesses. Cities ben­efit from their sports teams only in terms of people who are drawn to the city or who make expen­di­tures they oth­er­wise would not have.

Lots of econ­o­mists have looked at these “public” ben­e­fits and nearly unan­i­mously con­cluded that they fall far short of what pro­po­nents claim. That does not mean we do not value our sports teams. It’s just that we need to be careful about pro­viding public sub­si­dies to them.