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Changes and trends in the investment environment before and after the COVID-19 outbreak

The COVID-19 outbreak in 2020 has had a huge impact on the global economy and stock markets, and investors have changed their direction. In order to find some laws in the drastic stock market changes, we selected the stock market information of ten different industries, using the Markowitz model and Index model, and came up with some important data such as minimum variance, effective frontier and so on. Based on our research and the data available, we believe that investors should pay more attention to buying shares of high-tech companies and, where appropriate, sell shares of traditional energy companies and maintain continued buying of stocks of commodity companies in order to maximize returns with minimal risk.