It can be a tough job making a professional sport consistently popular and financially secure.
Look at how some football clubs in Europe seem to permanently teeter on the edge of bankruptcy, loaded with huge debts.
But in America, the NFL or National Football League has built a loyal following for American football and tried to keep its finances stable.
It is the most popular sport in the US, even beating baseball in the popularity stakes.
Uniquely, the teams share at least half of their revenue from lucrative TV rights, merchandising and ticket sales, but some now want it changed.
First broadcast on Business Daily
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