
Hi traders. I’ve looked over the forum and haven’t found any decent thread about money management and this topic is not just important. Proper money management distinguishes survival from failure.
I see too many traders with enough experience who continue blowing up their accounts over and over again just because they fail to manage their capital properly, they take too much risks for their positions.
Why is this important?
You may ask – if my trading system is good and I can generate good entries on consistent basis, why I should care much about this? I can take high leverage and earn money, that’s how it works, isn’t it?
No. Our ability to predict market moves or even be right more than 50% of the time is limited naturally. By accepting this fact you recognize that in your trading you WILL have drawdowns. You will have losing days, weeks and months (I hope, not years, but it is also realistic). And you have to be prepared. Of course, you will do everything to reduce your drawdowns, to adapt your strategy or trading plan to changed market conditions, but drawdowns are the part of the game – one can’t sustain permanent growth without corrections.
Once you accept the fact that your abilities to predict market action (as well as any other person’s abilities) are limited, you come to importance of money management. You need to survive.
Mathematics of survival.
Let’s assume that we use very simple money management principle – in each trade we risk certain amount of capital, say – 2, 3 or 5%. If you had, say, 1000 USD at the beginning of this process and put 5% at risk, you will have 950 USD if you are stopped out of your position. After that, you will be able to risk only 950*5% = 47,5 USD and so on.
In a graph shown below you see quantity of losses that you can possibly have before losing entire capital. Of course, it’s just theoretical graph – it doesn’t take into consideration lowest possible trading size, margin, spreads and commissions. But it shows that when your raise your lot size, you decrease robustness of your trading in non-linear way. Having 6% of capital at risk is more than 2 times riskier that having 3%. Having 10% at risk is more than 2 times riskier than 5%.
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To survive possible tough times, your trading needs to have enough level of robustness. Even if you flip a coin, you will have greater chances of survival if you apply appropriate money management rules. But if you analyze the market and achieve good profit/loss ratio, you would expect not only to survive but also to have your equity curve going forward.
Martingale:
The easiest way to blow up your account is applying martingale principle. You increase your lot size twice after being stopped from the position. In this case you have basic assumption that market will inevitably return at least to a point where you opened your first position. You average your loss expecting to cover it if price returns. In most cases it works, it may even work for some long period of time, but in case of directional break, your losses will inevitably exceed your available margin – thus, your account will be liquidated. «Not for me, not this time» - this is a prayer of every martingale trader.
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Fixed proportion method:
That’s the simpliest money management principle. You just take 2-3% of your capital (or whatever) and calculate it from your available margin (deposit size). When size of your deposit decreases, you also reduce your size, when it increases, you slowly increase your size.
Every money management principle has it’s benefits and drawbacks
Benefits:
Robustness, ability not to lose much in case you experience unexpected drawdown
Drawbacks:
Slower recovery. If you would risk fixed fraction in your trade (say, fixed amount in dollars), you would recover more quickly in case of drawdown. But of course, in this case you would accept greater risks
Fixed fraction method:
In this case you simply put predefined amount in dollars at risk in each trade. If you start with 2000 USD and decide to put 100 USD at risk in each trade, you are not expected to change this trade size even if your equity goes down. But you should increase your lot size as your equity curve goes up.
This money management principle is the most aggressive and definitely not recommended for beginner traders.
Your leverage will increase as (if) your equity goes down and your risks too.
Benefits:
Quicker recovery from drawdowns
Drawbacks:
Relative loss size (and risk) increases as equity goes down
To be continued…