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Analysis on the Stock Investment Strategy of Apple and Microsoft

The outbreak of Covid-19 has dramatically affected the financial market. Apple and Microsoft, which are at the top of the market value rank, are more concerned by investors. Based on the current situation of stock investment, this paper analyzes the cash flow and macro-economy of Apple and Microsoft, uses the Markowitz mean-variance model to conduct quantitative analysis on the stock portfolio, and determines the optimal investment weight. This paper studies the stock investment value of the two companies, and the results of it are only for investors' references.