Quote from nukethewhales31:
the example was 1 to 1 and 50% or breakeven not included spread or commiss
you lose with a % base MM were as with fixed you would BE.
sure i could say that 1 to 2 at 50% would make money to... with a fixed back look again at the 1 to 2x at 50% your BE in % because
100 ... 50 ..100 1 loss @50% then win at 100% your BE
100...200...100 1 win @ 100% then loss at 50% your still BE
so yeah its different... your just breaking even with 1 -2 risk reward setup at 50% edge.......
fixed would be making money thats why i suggest fixed as with the same setup you would be profitable and you have to have a BIGGER edge to make a system based on %ages as profitable.. as you create platforms where you would increase the fixed amount with capital increase it would not compound as smoothly but is more risk adverse and stable and allows the system to be made profitable even with a smaller edge
tho i agree that the fixed should be below 1% risk
NUKE
The problem is that the correct % of bankroll to invest for optimal growth for a system that has a 50% edge and 1:1 risk is 25% of the bankroll. No other % in this scenario will grow your bankroll as quickly as investing 25% of your bankroll on each one at a time individual trade. What your example correctly points out is that if you invest too large of a % of your bankroll based on your edge/risk, even though you have a huge edge you can turn that system from a huge edge to no edge and even a loss.
However, % (Kelly) style investing works best when you have an accurate picture of your edge/risk. If you do, then there is only one correct % of your bankroll based on your edge/risk that will maximize growth. If you do not have an accurate picture of your edge/risk and/or you are just more conservative (as I am), then it is much better to understimate the % then to overestimate the %. If you overestimate, there is a greater chance that you will go bankrupt. If you underestimate, the worse that can happen is your bankroll will not grow at the maximum rate but it will grow.
I personally use a half-Kelly and my calculations are bit trickier because I am mostly a hedge investor. Again, everyone has to find what works for them. % works for me so I use it. I would recommend % investing to anyone that had a quantifiable edge but % investing has to applied correctly to work properly. Even if one has the best tools, if they are not used correctly, they will not get the desired results.
Joe.