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Example of the optimal Kelly betting fraction, versus expected return of other fractional bets. In probability theory, the Kelly criterion (or Kelly strategy or Kelly bet) is a formula for sizing a sequence of bets by maximizing the long-term expected value of the logarithm of wealth, which is equivalent to maximizing the long-term expected geometric growth rate.
To estimate the number of periods required to double an original investment, divide the most convenient "rule-quantity" by the expected growth rate, expressed as a percentage. For instance, if you were to invest $100 with compounding interest at a rate of 9% per annum, the rule of 72 gives 72/9 = 8 years required for the investment to be worth ...
The expected rate of return for the second investment is (.45 * .2) + (.55 * -1) = -46%; The expected rate of return for the third investment is (.8 * .5) + (.2 * -1) = 20%; These calculations show that in our scenario the third investment is expected to be the most profitable of the three. The second one even has a negative ROR.
The rate of return on a portfolio can be calculated indirectly as the weighted average rate of return on the various assets within the portfolio. [3] The weights are proportional to the value of the assets within the portfolio, to take into account what portion of the portfolio each individual return represents in calculating the contribution of that asset to the return on the portfolio.
It was proposed by investor and professor of Columbia University, Benjamin Graham - often referred to as the "father of value investing". [1] Published in his book, The Intelligent Investor, Graham devised the formula for lay investors to help them with valuing growth stocks, in vogue at the time of the formula's publication. [2]
Real estate mogul and financial expert Barbara Corcoran recently shared her investing formula for buying real estate -- a method that has turned out well for her. Experts: Make These 7 Money...
Our 2025 yield growth outlook is on top of 11.6% growth in 2024 that was boosted by fourth-quarter outperformance and put 40 basis point headwind on this year's growth metric.
Return on investment (ROI) or return on costs (ROC) is the ratio between net income (over a period) and investment (costs resulting from an investment of some resources at a point in time). A high ROI means the investment's gains compare favorably to its cost.