Background
Van Tharp (Dr. Van K. Tharp) is a trading psychology coach and the foremost authority on position sizing. His book 'Trade Your Way to Financial Freedom' introduced the concept that position sizing — not the entry strategy — is the primary determinant of trading performance. His R-multiple framework provides a universal language for measuring and comparing trade results.
Core Methodology
Tharp's key insight: two traders using the exact same entry and exit signals but different position sizing can have vastly different results — one profitable, one bankrupt. He developed the R-multiple framework where R = initial risk per trade. A 3R winner means the trade made 3x the initial risk. This normalises results across different strategies and markets.
Key Trading Rules
- Define R (initial risk) for every trade before entry — this is your fundamental unit of measurement
- Express all results as R-multiples: a $300 profit on a $100 risk = 3R winner
- Position size determines your destiny — not your entry strategy
- Test position sizing models: fixed risk (1-2% per trade), fixed ratio, Kelly criterion, optimal f
- System quality = (average R-multiple × win rate) / standard deviation of R-multiples
- Design systems for your personality: trend followers need patience, scalpers need speed — match the system to the trader
Key Concepts
Books & Resources
Trade Your Way to Financial Freedom by Van Tharp. Super Trader by Van Tharp. The Definitive Guide to Position Sizing by Van Tharp. Van Tharp Institute (vantharp.com).