+Portfolio Theory offers a framework for rational investors to construct a collection of [Assets](/wiki/asset) aimed at optimizing expected [Risk](/wiki/risk) and return. It guides the creation of diversified portfolios, seeking the "efficient frontier" where maximum return is achieved for a given level of risk.
+## See also
+- [Investment](/wiki/investment)
+- [Diversification](/wiki/diversification)
+- [Capital Market](/wiki/capital_market)
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