全球化競爭不僅加快產業結構的調整速度,也讓產業照著其調整的方向努力邁 進。產業結構的變化,使得廠商必須因應結構的改變而做出適合的決策,也因此對 經營績效產生影響。 本研究利用傳統的SCP(Structure-Conduct-Performance)模式來了解產業內的市場 結構、廠商行為與產業績效之間的關係,並且利用台灣經濟新報之分類將台灣上市 櫃公司分為85 個產業,以賀芬達指數衡量產業集中度來了解產業集中度、廠商獲利 能力與股票報酬之間的關係。本研究結論如下: (一)本文發現產業集中度的變化會影響獲利能力的改變,但是各指標的結果有所 不同,利用不同的分類方法分類的結果顯示產業集中度越高其獲利能力越佳。 (二)當產業的集中度越集中時,產業的E/A 數值越大,也就代表著當產業集中度 越大時,其獲利能力會增加;從R&D/A 的數值中,也顯示出產業集中度越低 的產業,越願意去從事創新研發的工作。 (三) 利用BINS 的分類方式顯示出產業越集中其報酬率較差,而利用QUANT 的分類方式顯示出產業越集中其報酬率明顯高於產業不集中的報酬率。
Global competition is not only accelerate the speed of adjustment of industrial structure, but also allow industry to adjust according the direction of its move. The change of industrial structure, makes the firms must respond to changes in the structure to make the right decisions, and also affect performance. This study using traditional SCP (Structure-Conduct-Performance) model to understand the relationship of market structure within the industry, conduct and performance, we using TEJ to classify Taiwan listed companies into 85 industries and use Herfindahl-Hirschman index to measure industry concentration to understand the relationship between industry concentration and profitability and industry concentration and stock returns. This study conclusion as follows: (Ⅰ)We find that changes in industrial concentration will affect the profitability, the results of each index is different, using different classification categories shows that more concentrated industries have higher profitability. (Ⅱ)E/A(earnings to assets) is higher for the firms in highly concentrated industries, also represents the firms in highly concentrated industries, its profitability will increase; the value of R&D/A shows the firms in lower concentrated industries, , the more willing to engage in R&D work. (Ⅲ)We using BINS classification, it shows firms in more concentrated industries earn lower stock returns, on the other hand, using QUANT classification, it shows firms in more concentrated industries earn higher stock returns.