Since there is no linear correlation between the bitrate of a video stream and its perceptual quality [1], the fairness algorithm should assure that users get similar qualities rather than similar bitrates.
References
[1] G. Cermak, M. Pinson, and S. Wolf. The relationship among video quality, screen resolution, and bit rate. Broadcasting, IEEE Transactions on, 57(2):258–262, 2011.
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