# Kelly Criterion for Asset Allocation and Money Management

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Investors are often told how important diversification is and how much money they should put into each company or area. These are all questions that may be used to a money management system, such as the Kelly Criterion, which is one of several allocation systems that can be used to successfully manage money. The Kelly strategy, Kelly formula, or Kelly bet are various names for this approach.

This article explains how this method works and how investors may use it to aid with asset allocation and money management.

### Key Takeaways

• The Kelly Criterion is a mathematical method that helps investors and gamblers choose how much money to put into each investment or bet.
• The Kelly Criterion was invented by John Kelly, a Bell Labs researcher who devised the criteria to examine long-distance telephone signal noise.
• The percentage produced by the Kelly equation shows the amount of a stake that an investor should take, assisting with portfolio diversification and money management.

## History of the Kelly Criterion

The Kelly Criterion was created by John Kelly while working at AT&T’s Bell Laboratory to help AT&T with their long-distance telephone signal noise problems. Soon after, in 1956, the approach was published as “A New Interpretation of Information Rate.”

However, the gambling world became aware of it and recognized its potential as an ideal horse racing betting method. It allowed gamblers to increase the amount of their bankroll over time. Many individuals now utilize it as a general money management strategy for both gaming and investing.

The Kelly Criterion technique is well-known among major investors such as Berkshire Hathaway’s Warren Buffet and Charlie Munger, as well as famed bond trader Bill Gross.

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## The Basics of the Kelly Criterion

The Kelly Criterion has two main components. The first is the win probability, or the likelihood that any particular deal will result in a profit. The second factor is the win/loss record. This ratio is calculated by dividing the total positive trade amounts by the total negative trade amounts.

These two variables are then entered into Kelly’s equation, which is:

K%=W−(1−W) where K % = TheKellypercentage W = Probability of winning R = Beginaligned Win/Loss Ratio & K% = W – fracleft(1 – Wright) R textbf where: &K% = textThe Kelly percentage &W = textWinning probability &R = textWin/loss ratio endaligned ​​

The equation’s result, K%, is the Kelly percentage, which has a number of real-world uses. The Kelly criteria may assist gamblers optimize the amount of their wagers. It may be used by investors to calculate how much of their portfolio should be allocated to each investment.

## Putting It to Use

Kelly’s technique may be used by investors by following these easy steps:

1. Access your most recent 50 to 60 transactions. Simply contact your broker or check your most recent tax returns to see whether you claimed all of your transactions. If you are a more experienced trader with a well-developed trading method, just backtest it and accept the results. The Kelly Criterion, on the other hand, presupposes that you trade the same manner you did in the past.
2. Determine “W”—the winning probability. Divide the total number of deals by the number of trades that yielded a positive sum (both positive and negative).This value improves as it approaches one. Any integer greater than 0.50 is acceptable.
3. Determine “R”—the win/loss ratio. Divide the average gain of the positive transactions by the average loss of the negative deals to arrive at this figure. If your average profits exceed your average losses, you should have a number larger than one. A score of less than one is tolerable as long as the number of lost deals is kept to a minimum.
4. Enter these figures into Kelly’s calculation above.
5. Keep track of the Kelly % that the calculation produces.
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## Interpreting the Results

The percentage (a value smaller than one) produced by the calculation shows the magnitude of the positions you should take. For example, if the Kelly percentage is 0.05, you should hold 5% of the shares in your portfolio. This technique basically tells you how much you should diversify.

However, the approach does need some common sense. Whatever the Kelly percentage tells you, one thing to remember is to devote no more than 20% to 25% of your money to one stock. Any more than this entails significantly greater financial risk than most individuals should accept.

## Is the Kelly Criterion Effective?

The foundation of this system is pure mathematics. Some may dispute if this logic, which was initially devised for telephones, is applicable in the stock market or gambling areas.

An equity chart may illustrate the success of this technique by displaying the simulated development of a specific account based on pure mathematics. In other words, the two variables must be inputted properly, and the investor must be expected to be capable of maintaining such performance.

## Why Isn’t Everyone Making Money?

There is no such thing as a flawless money management method. This technique will assist you in effectively diversifying your portfolio, but it is limited in several ways. It cannot recommend winning stocks or forecast market disasters (although it can lighten the blow).There is always some “chance” or unpredictability in the markets, which might change your results.

## The Bottom Line

Money management cannot guarantee outstanding results all of the time, but it may help you reduce your losses and maximize your profits via effective diversification. The Kelly Criterion is one of many models that may be utilized to aid with diversification.

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