I'd like to open a discussion about intraday futures leverage and how you all go about determining trading size. It might be easier to have specific examples so let's assume the following: 1. Very liquid markets where your trading impact on prices is negligible and spread is almost always one tick (stock indices, treasuries, major currencies). 2. Intraday time frame only, no positions held overnight. 3. Assume that you will always be able to exit entire position at a given stop price (for discussion's sake). 4. You trade relatively infrequently with tight stops (5-10 ticks), averaging 2 or 3 entries a day. You have an edge which has shown consistent profitability; it is just a matter of applying the capital when necessary. How would you determine the number of contracts to trade each time? Let's assume 100K account equity for example's sake. Give an example or two and how you come to that number; also explain your reasoning for not doing larger size than what you've determined, given the circumstances above. In other words, when do you cross the line in using too much leverage, and how do you find out where that line is?