Abstract
The period 2020-2021 is destined to be one of the most extraordinary periods in China's investment history, having experienced too much "uncertainty". During the past 30 years of sustained economic expansion, both the median household income and the median household standard of living have steadily climbed. People are doing everything they can to protect and grow the value of their disposable income, which is the amount of money left over after covering basic living costs. Therefore, a growing number of individuals are opting for the riskier strategy of investing in stocks to control their personal finances. Our investors frequently confront two stock investment challenges: deciding which of several good stocks to buy to maximize returns, and deciding which of those stocks to buy based on the relative merits of each. Therefore, this article considers four typical companies in the US as examples, analyzes investment ratios using the Markowitz portfolio, and then investigates whether there are better options to aid customers.
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