大陸自1979年改革開放以來，受到台灣與大陸雙方彼此資源稟賦差異和比較利益的不同，且台商對大陸投資不斷增加，帶動台灣地區資本財及其一般零組件出口，使區域內的垂直分工產業體系逐漸建立，也使得雙邊貿易快速的成長。 傳統的國際貿易理論，都是以探討消費財的貿易型態，但隨著商品製造過程不再侷限於單一國家，而是透過多國多階段專業化垂直分工的生產方式來完成，使得中間財貨扮演越來越重要的角色。本文研究透過台灣、大陸和美國三國技術進步率的不同來說明這三個國家彼此之間貿易型態（包括中間財與消費財），以及相對工資的演變，特別是台灣出口逐漸被大陸出口取代的現象。 Since China has launched its reform and open-door policy in 1979, it has achieved remarkable progress in economic development. China has very high trade-GDP ratio and the largest market for FDI flow amoong the developing economies. As a result, Chinese economy has been increasingly integrated to the world economy. Not only does FDI play a significant role in supporting China’s economic growth but a new network of production and services in vertical-specialization-based trade also has been developed. This has been witnessed especially in the cross-strait relations between Taiwan and Mainland China. Importantly, this vertical-specialization-based trade is increasingly depended on exchange of parts, components and other intermediate products to produce goods it later exports, reflecting the sequential stages of production networks among many different countries. In this paper we modify the Ricardian model of Dornbusch, Fischer and Samuelson（1977）to setup up a model with three countries and two stages of production to study the effects of vertical specialization on the changes of trade patterns especially to explain why some of Taiwan exports to the United States are replaced by China exports.
