[Phantom Lord]

Knockout rates are lower in MMA competitions than in boxing

Unlike in boxing, fighters most often quit in MMA, as is one of the methods of winning a fight. How often does a boxer just up and quit in the middle of a fight. Other than Roberto Duran, I am hard pressed to name another figher who has done it. Though it has to happen from time to time, but it is exceptionally rare.

[Clint N. Suhks]

fighters most often quit in MMA,

I haven't seen every MMA fight there is but I've seen quite a few. Not once have I ever seen a fighter quit unless you are talking about submissions. Submissions are part of the sport and prevents injury. I'd hardly call that quitting.

[razorback-bert]

Plenty have taken a dive, tanked a match, because they were told to.

Fixed fights and dancing boxers are responsible for the decline of boxing.