The mathematical process of selecting the best mix of investments to achieve specific objectives, typically maximizing expected return for a given level of risk or minimizing risk for a target return. It uses statistical techniques to balance risk and reward across multiple assets.
From Italian 'portafoglio' meaning 'carry leaves/papers' and Latin 'optimus' meaning 'best.' Modern portfolio optimization was formalized by Harry Markowitz in 1952, revolutionizing investment management by treating portfolios as integrated systems rather than collections of individual securities.
Portfolio optimization is like being a master chef who knows exactly how much of each ingredient to add to create the perfect dish - except instead of flavors, you're balancing risk and return across different investments! Markowitz's breakthrough insight was that diversification isn't just about 'not putting all eggs in one basket,' but about finding investments that zig when others zag.
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