Modern Portfolio Theory (MPT) is a mathematical investment framework developed by Nobel Prize-winning economist Harry Markowitz in his landmark 1952 paper 'Portfolio Selection,' which revolutionised how investors think about risk and return by demonstrating that the risk-return profile of a portfolio is not simply the weighted average of its individual holdings — but is fundamentally shaped by the correlations between the assets in the portfolio. MPT's central insight is that investors can construct an 'efficient frontier' of optimal portfolios that offer the maximum expected return for each level of risk (standard deviation), enabling rational investors to select portfolios aligned with their individual risk tolerance. By combining assets with low or negative correlations, diversification reduces portfolio volatility without proportionally reducing expected returns. MPT underpins the Capital Asset Pricing Model (CAPM), factor investing, and the entire discipline of quantitative portfolio management. For investors and wealth managers on Ventura Securities, MPT provides the theoretical foundation for asset allocation decisions, diversification strategy, and the construction of risk-adjusted portfolios across equity, debt, gold, and alternative assets.
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