Investment Analysis of the Logistics Industry

After Covid-19, the American stock market experienced a big impact. This paper mainly focuses on consequent influence logistics industry in US and investment portfolio them. also aims to compare average return, standard deviation sharp ratio of two classic models: Markowitz model Index before after covid-19. Through analyzing data 10 stocks America Standard Poor 500 as reference from 2019 2021 using these models, it is found that return was much higher with corresponding covid-19, disregard models portfolio. It had better overall performance (smaller ratio) than (although they always same return), impact pandemic.