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Understanding how this interpretation of kelly criterion helps the trader
Three important things worth remembering about Kelly when applied to real world edges: 1) Full Kelly staking is gut wrenchingly volatile. While it maximises the growth of the bankroll, it does so in a way that still leaves you very likely to experience massive (50%+) reductions in capital. Most long terms users of Kelly tend to stick in the 1/4 to 1/2 Kelly unit range to try and stay sane and retain a margin of error. See below for how large the typical swings can be with full Kelly:  2) Garbage in, garbage out. If you are making errors in pricing your actual edge, Kelly becomes very wrong very fast, easily leading you to a high chance of ruin if you are over estimating your true edge. As most people do massively over estimate their edges, Kelly simply pushes them far into territory where risk of ruin is high. 3) A Kelly user prefers to back likely outcomes over non likely ones, even to the point where they prefer a smaller % edge if the chances of winning are better. Compare the below comparison of growth between two betting scenarios (decimal odds, so for the percantage chances do 1/odds):  In this case, despite the percentage edge on the red bet being higher than that of the green, in terms of bankroll growth it ends up only being roughly as good to a kelly gambler as the smaller edge on the more likely event. This has an obvious effect on the types of edges you should be seeking out if given choices between liklihoods.