Position Sizing (a.k.a. Money Management)
From Trader Mike:
Position sizing could very well be the most important aspect of a trading system, yet, like expectancy, it’s rarely covered in trading books. A position sizing model simply tells you ‘how much’ or ‘how big’ of a position to take. Position sizing can be the key factor in whether or not you stay in the game or whether your gains are huge or minimal.
Strategesis 
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