投資組合理論
portfolio theory
簡單來說，投資組合理論的要義便是分散投資，例如分散投資在不同股份，不同種類行業，甚至投資在不同國家，這樣便會把風險分散，令投資組合的表現更為平穩。
In simple terms, the essence of portfolio theory is to diversify the investment, such as diversification of investments in different shares of different types of industry, and even investment in different countries, and this will spread risks, so that portfolio performance is more stable.