A review of literature in economics and marketing suggests that since Raymond Vernon published his article "International Investment and International Trade in the Product Cycle" in 1966,1 there has been a simultaneous development of literature pertaining to the 'product cycle' in marketing. There are differences between Vernon's concept of the product cycle and marketers' perception of the product life cycle. However, when one reviews publications in areas where these disciplines tend to overlap, particularly in international marketing and international business, both of these terms tend to fuse together and be used almost interchangeably. While discussing Vernon's model, Louis T. Wells, Jr. states that "the model claims that many products go through a trade cycle, during which the United States is initially an exporter, then loses its export markets and may finally become an importer of the product"2. Warren Keegan, a marketing scholar, on the other hand, refers to the International Product Life Cycle in the following manner: "The International Product Life Cycle model suggests that many products go through a cycle during which high income, mass consumption countries are initially exporters, then lose their export markets, and finally become importers of the product."3 These are clear instances where trade cycle and product life cycle have been defined almost identically in the international context. There could be several possible explanations for the interchangeable use of the product cycle and product life cycle concepts. One explanation is that the product cycle, developed by economists as part of the international framework, was initially unknown to marketers when they developed the product life cycle concept.4 Another possibility is that marketers, in order to extend the product life cycle concept to international markets, borrowed the product cycle concept from economists who employed the concept to explain patterns of international trade. The interchangeable use has created conceptual fuzziness in the literature and has overshadowed the differences between the two. II. PRODUCT CYCLE AND PRODUCT LIFECYCLE
The purpose of this paper is to make a distinction between the product cycle and product life cycle concepts, clarify the relationship between the two and redefine the international product life cycle. Raymond Vernon, attempting to explain patterns of international trade, observed a circular phenomenon in the composition of trade between countries in the world market. Advanced countries, which have the ability and competence to innovate as well as high-income levels and mass consumption become initial exporters of goods. However, they lose their exports initially to developing countries and subsequently to less developed countries and eventually become importers of these goods. Vernon's hypothesis was an attempt to advance the trade theory beyond the static framework of the comparative advantage of David Ricardo and other classical economists. It explored hitherto ignored or unexplained areas of international trade theory such as timing of innovation, effects of scale economies and the role of uncertainty and ignorance in trade patterns. His intent was not to propose a theory of product life cycle as commonly understood by marketing theorists. The product life cycle concept, typically expressed as an "S" shaped curve in marketing literature, is based on the analogy of the human biological cycle.5 Products, like living organisms, go through stages of birth, development, growth, maturity, decline and demise. To be meaningful, the product life cycle concept has to be used in conjunction with its counterpart, market evolution that is comprised of various stages of market development. Philip Kotler links both product life cycle and market stages in his concept of market evolution.6 The product cycle concept identifies four stages that the trade patterns go through. Louis Wells identifies these...
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