“Buffett and Munger took their annual shot at debunking modern portfolio theory. ... In modern portfolio theory, beta is used as a measure of the volatility and, thus, the risk of an investment. However, Buffett sees the use of beta as nonsense, emphatically stating, “Volatility is no measure of risk to us.”
So what does Warren Buffet say about Modern Portfolio Theory? Modern Portfolio Theory or MPT is built on the theory that the markets are efficient. The premises is to build a portfolio that is comprised of various asset classes and different sectors. Then over time, you rebalance the portfolio as necessary.
The principles of modern portfolio theory still hold true, and the theory works to achieve the objectives that many clients prioritize. But advisors must understand its limitations and find a practical application that increases its level of effectiveness in today's markets.
At its heart, modern portfolio theory makes (and supports) two key arguments: that a portfolio's total risk and return profile is more important than the risk/return profile of any individual investment, and that by understanding this, it is possible for an investor to build a diversified portfolio of multiple assets ...
Modern portfolio theory (MPT) is a theory on how risk-averse investors can construct portfolios to maximize expected return based on a given level of market risk. MPT can also be used to construct a portfolio that minimizes risk for a given level of expected return.
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