How Much is Too Much? (Position Sizing)

"30 people in a room, everyone gets the same exact trades in the same exact sequence. How many different outcomes will result?

Years ago I did a lot of work with Van Tharp, one of the original Market Wizards from Jack Schwagers books. Van had game where he had 100 marbles in a bag, each representing a trade. Each marble (trade) was denoted with a return that was a multiple of the risk (know as “R”) taken on that trade, +1R, -2R, + 5R, etc. 60% of the marbles (trades) were winners. The unknown was the amount of the gain or loss from each trade. Participants were each allocated $100,000 and instructed to bet a percentage of their equity on each marble pull. The range of results was astounding. Some made huge multiples of their equity some made a solid return, some had small losses and some blew out. In all there were 30 different results."

http://daytraderbootcamp.com/blogs/the-traders-jacket/how-much-is-too-much-position-sizing/