在臺灣，電機電子業是製造業中相當重要的產業，然而此類商所面臨的經營風險相當大。作者在有中，探討造成這些經營風險變化的原因。作者利用1996年臺灣電機電子業抽樣調查廠商的資料，應用因果鏈條模式，計算鏈條中的經營比例加權的變異係數。藉由這些變異係數大小排列的結果，探討縮小經營比例離散範圍的作用力。最後提出兩類作用力，第一類是法令規定、技術結構、勞動供需、要素特性與緩慢變遷的市場型態等規則類作用力；第二類是優化組合與綜合理財等權威類作用力。

In Taiwan, the electrical & electronic manufacturing industry, facing very high risks, is very important among the manufacturing industries. The author discusses the reasons for running those various business risks. The original sampling data from the electrical & electronic manufacturing industry of the 1996 industrial census in Taiwan was used. The causal-chains-model was applied to calculate the weighted coefficients of variation of business ratios in causal chains. By ranking those coefficients, the author investigates the acting forces for narrowing the dispersion range of business ratios. At the end, two types of forces were suggested: one is the kind of rules concerning regulation of laws, technical structures, supply and demand of labors, characteristics of production factors, and slowly-changed pattern of markets; the other is the kind of authorities, such as the portfolio selection of optimal assets and synthetic management.