For the retail trader, learning to scale up your position size can be a nerve-wracking process that can lead to unexpected and outsized losses.
How big a position you should take in the market usually is governed by the amount of money in your account. It seems that when you trade a small number, things go right. No matter what you do, you are a winner. Money rolls in. Your account swells.
Many people are not content to have their accounts roll up the dough. They will always want to accelerate the process of money accumulation. They reason that if they traded a certain size, all they have to do is increase that number, and they will increase their earning power.

Somehow, it just doesnít work that way. When we increase the size of our positions, a funny thing happens. We usually begin to lose money. And a lot of it. It all depends on how you increase your size.
Weight lifters gradually put more iron on the bar. They don’t suddenly go from one hundred to three hundred pounds. They go in small increments.
Our minds are very much like muscles. They can handle only a gradual increase in the risk that we assume in the market. Too sudden a shift in risk size disturbs our equilibrium and sense of the marketís ebbs and flows.
Most of Traders reach a number that we can’t seem to exceed. We can be successful at one level but not at a higher one.
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Why is it that this phenomenon of size occurs?
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What makes it difficult to trade large numbers and continue to be successful?
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What magical power takes over when weíve increased our risk and sense of adventure?
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Knowing that this law of size increase results in a disaster, why can’t we restrain ourselves and live with this truth?
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What keeps us returning to retest this great law?
Our egos insistence that this won’t happen again seems to overpower our judgment. It canít believe that it isnít ready to be a bigger trader.Our sense of self is enhanced by size, be it in trading large numbers, living in a big house, driving a big car, or owning a big boat. Our egos swell in proportion to the bigness of our risk assumption.
Egos want to be bloated, and one way is to trade bigger than we are capable of doing successfully. Egos often will deny the reality of their inability to function at a higher risk level. They will tell us that they have it under control this time and that they are strong enough to do well at a greater trading size.
The pain of being wrong seems to increase exponentially in relation to the size of the position. If we normally trade one lots and now we are trading twos, the degree of difficulty in acting quickly when we are wrong is not twice but perhaps five times as great.