English: This graph shows the expected value of different betting fractions. The game in this example is for a coin flip win-or-lose, with the coin weighted to win 60% of the time. The optimal bet, called the Kelly bet, is 20% of the bankroll. Over time, on average, each round will increase the bankroll by 2.03%. Betting less than 20% will have a lower average return, e.g. betting 10% will provide an average 1.5% increase. Betting over 38% percent will result in losing money over time.