The Tampa Bay Business Journal's network composed a list of 83 North American markets and their abilities support new - or their existing - sports teams, based on personal income levels in the market.
I used a 2011 study to write why the Rays wouldn't be moving to frequently-mentioned cities such as Nashville or Portland since the markets were already over-extended. The 2015 version of the study indicates they still couldn't support a new team (just like Charlotte, San Antonio, Indianapolis, etc).
On the other end of the spectrum, the study suggests Montreal would be MLB's most logical expansion/relocation market. Its available income in the immediate metro area suggests the city could afford to support a MLB team in addition to its existing NHL and MLS franchises.
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This study is not without flaws - it defines the Tampa Bay market too narrowly, for instance. It didn't include Sarasota (and presumably Manatee County), even though many of the residents there can reach the Trop in 15-30 minutes.
But the study suggests Tampa Bay is running a personal income deficit and cannot afford to support three major sports teams. It's certainly not the first time questions about the market's pro sports capacity have come up and you can count that it won't be the last either.
As TBBJ's Wade Tyler Millward writes, MLB could potentially improve its situation by moving the Rays to franchise-poor markets with available income such as Las Vegas, Hartford, or Virginia Beach:
Mexico City and Havana are possibilities if MLB tries to expand into Latin America. Last year, 23 percent of players came from Latin America, mainly from Dominican Republic, Venezuela and Cuba. MLB has not pursued this option because of income disparity between North America and the rest of the hemisphere, Thomas said.
New York-New Jersey and Los Angeles-Anaheim residents make enough to support a third MLB franchise, but the reality of existing teams protesting more competition makes those areas a slim chance. Their residents make, respectively, $787 billion and $345 billion more than is needed to support their major sport teams.