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The purpose of this study is to explore the relationship between the sales of five industries of repair and installation of industrial machinery and equipment and Taiwan's economic cycles from January 1995 to December 2021, totaling 324 months. The industries include electronics and semiconductor production repair and installation, special-purpose machinery repair and installation, general machinery repair and installation, ship repair, and aircraft maintenance. The economic-cycle data are from National Development Council and the Taiwan Economic Journal. The conclusions are as follows. (1) The sales of aircraft maintenance lag behind (lead) the business cycles and the stock market in reaching the peak (bottom) during boom (down) periods. It shows that aircraft maintenance is a growing industry and its sales are not affected by the economic downturns. (2) The sales of the special-purpose machinery repair and installation lag behind the business cycles and the stock market in reaching the peak and bottom during boom and down periods. (3) The percentage difference of the sales of electronics and semiconductor production repair and installation ranges between 8.33% and 8.51%, regardless of in boom and down periods. Although the sales are affected by the business cycles, the volatility is limited. (4) The percentage difference of the sales of general machinery repair and installation is the smallest, regardless of in boom and down periods, implying that the sales of general machinery repair and installation are least affected by the business cycles. |