Sites like StubHub may let people sell some World Series tickets for eye-popping prices. But letting the free market work actually leads to cheaper...

Sites like StubHub may let people sell some World Series tickets for eye-popping prices. But letting the free market work actually leads to cheaper prices for fans.

Think of it as playoff ticket arbitrage.

Chicago Cubs fans flocked to Phoenix this week, drawn by significantly lower prices for tickets to the team’s first two playoff games against the Arizona Diamondbacks than they could find for tickets to games 3 and 4 back in the Windy City.

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