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The purpose of this thesis is to explore the lead-lag relations between the sales of computer-related products and the Taiwan business cycle as well as the highs and lows of the stock market index. The computer-related products include "portable computers", "industrial computers", "servers", "flash drives", "printers (including plotters)", "image scanners", and "peripherals", compiled by the Statistics Department of the Ministry of Economic Affairs. There are 300 months of data from January 1994 to December 2018. The business cycle indicators are published by the Taiwan's National Development Council. The results of the research are as follows: 1.Surrounding the peaks of the Taiwan business cycle and stock market index, server sales are a leading indicator. Sales of printers and plotters" is a leading indicator surrounding the lows of the Taiwan business cycle and stock market index. 2.Sales of peripherals fluctuated the least during the business cycle and stock market peak and low periods, indicating that they are the least affected by the economy and stock market. Sales of portable computers fluctuated the most during the peak and trough periods, indicating that they are the most affected by the economy and stock market.
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