Stock Market Volatility: A Comparison of Vertically Integrated Technology Companies

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Stock market volatility has been omnipresent in the information technology sector. This manuscript compares the stock performance of vertically integrated information technology companies across six different twenty-month periods between the years 1996-2006. The five companies included in the study are Apple, IBM, Hewlett-Packard, Sun Microsystems, and NEC. The focus periods include the browser era, the Y2K era, the post-Y2K era, the post-9/11 era, the outsourcing era, and the mobile/wireless era. The lowest stock market returns are in the Y2K or post-9/11 eras for all five firms. The highest stock market returns for the five companies in the study are spread across four different eras. The results imply that while vertically integrated technology companies have a tendency to decline in price in a down market, positive return periods in a bull market are not highly correlated within the industry.

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