高科技產業為台灣的經濟命脈，為了維持台灣高科技產業在全球居於領先的地位，企業必須持續並謹慎地評估投資在研發創新上的成本花費。研發成本的花費不但龐大且為長期的投資，因此對於廠商決策的影響佔有舉足輕重的地位。過去文獻針對寡占市場上廠商的決策已有諸多鑽研，而其中又以最具代表性的Cournot與Bertrand兩模式的比較居多，而此兩模式已由傳統的兩家廠商，延伸至N家廠商間的競爭，但過去文獻皆假設在同一時間點下，加入投資研發成本的參數，進行廠商決策後其利潤、消費者剩餘、社會福利等之比較。
由於高科技產業競爭激烈，不斷地有新技術、新知識的產生，使得高科技產品的生命週期越來越短，故產品生命週期已逐漸成為高科技產業中廠商求生存最主要的考慮因素之ㄧ，廠商必須在如此短暫的產品生命週期的環境下擬定最佳的競爭策略。因此本研究欲加入時間變數，運用已考慮研發成本後的Cournot與Bertrand分別代表數量與價格競爭的模式，找出在每個不同階段的產品生命週期裡，高科技產業中的廠商應採取何種決策方式較為合適，何種競爭模式方能使其利潤極大化。
最終，本研究結果顯示：在產品與技術生命週期中的成長期及成熟期階段下，採數量競爭即Cournot競爭較佳；而在導入期及衰退期階段下，採取數量競爭或價格競爭則無顯著差異。

High-tech industry is deemed to be the main economic lifeline of Taiwan, and all the high-tech oriented firms have to cautiously evaluate the cost of R&D investment in order to settle the advantageous position in the global market. There exist a great number of relevant literatures discussing the firms’ strategic decisions of oligopoly, especially the Cournot model and the Bertrand model, which have been extended the dimension of study domain from traditional two firms of duopoly to three firms or more. But they all discuss that firms compete for their market share and service profit at the particular time point not within a continuous time period.
In reality, the shorter product/technology life cycle becomes more important for firms to be capable of controlling the market competition, the accuracy of prediction product/technology life cycle which is one of the important factors making firms can survive in the market.
In view of the R&D production process, this study attempts to combine product/technology life cycle into Cournot and into Bertrand models respectively, and compares these two models on the basis of the characteristics of product/technology life cycle. Finally, the conclusion of this study is that the industrial net profit under Cournot competition is better than under Bertrand competition at the growth and maturity stages, but they are not remarkably divergent at the introduction and decline stages of the technology/product life cycle.

Abernathy, J. M. & Utterback, W. J. A Dynamic Model of Process and Product Innovation. Omega, the International Journal of Management Science, 3, 639-659, 1975.
Anderson, P. & Tushman, M., Technological Discontinuities and Dominant Designs: a Cyclical Model of Technological Change. Administrative Science Quarterly, 35, 604-634, 1990.
Anderson, S.P. & Neven, D.J., Cournot competition yields spatial agglomeration. International Economic Review, 32, 793-808, 1991.
Achilladelis, B. & Antonakis, N., The dynamics of technological innovation the case of the pharmaceutical industry. Research Policy, 30, 535-588, 2001.
Bergstrom, T.C. & Varian, H.R., Two remarks on Cournot equilibria. Economics Letters, 19 (1), 5-8, 1985.
Chen, M.C. & Huang, C.T., Flat panel display yearbook 2002. Industrial Technology Intelligence Services, Hsinchu, 2002.
Chen, M.C. & Huang, C.T., Flat panel display yearbook 2003. Industrial Technology Intelligence Services, Hsinchu, 2003.
Chen, M.C. & Huang, C.T., Flat panel display yearbook 2004. Industrial Technology Intelligence Services, Hsinchu, 2004.
Chen, R.L., Almanac of food industry in the Republic of China on Taiwan 2004. Food industry Research and Development Institute, Hsinchu, 2004.
Delbono, F. & Denicolµo, V., R&D investment in a symmetric and homogeneous oligopoly. International Journal of Industrial Organization, 8, 297-313, 1990.
Edgeworth, F., La teoria pura del monopolio. Giornale Degli Economisti, 40, 13-31, 1897.
Foster, R. N., Innovation: The Attacker’s Advantage. Summit Books, New York, 1986.
Février, P. & Linnemer, L., Idiosyncratic shocks in an asymmetric Cournot oligopoly. International Journal of Industrial Organization, 22 (6), 835-848, 2004.
Godoe, H., Innovation regime: R&D and radical innovations in telecommunications. Research Policy, 29, 1033-1046, 2000.
Hotelling, H., Stability in competition. Economic Journal, 39, 41-57, 1929.
Hamilton, J.H. & Thisse, J.F. & Weskamp, A., Spatial discrimination: Bertrand vs. Cournot in a model of location choice. Regional Science and Urban Economics, 19, 87-102, 1989.
Häckner, J., A Note on Price and Quantity Competition in Differentiated Oligopolies. Journal of Economic Theory, 93, 233-239, 2000.
Hashimoto, K., Product life cycle theory: a quantitative application for casino courses in higher education. International Journal of Hospitality Management, 22, 177-195, 2003.
Higgins, R.S. & Johnson, P.A. & Sullivan, J.T., Merger of Bertrand competitors can decrease price. The Antitrust Bulletin, 50 (2), 285, 2005.
Harvey E. & Lapan, D.A. & Hennessy., A note on cost arrangement and market performance in a multi-product Cournot oligopoly. International Journal of Industrial Organization, 24, 583-591, 2006.
Hsu, J., & Wang, X.H., On Welfare under Cournot and Bertrand Competition in Differentiated Oligopolies. Review of Industrial Organization, 27, 185-191, 2005.
Kim, B., Managing the transition of technology life cycle. Technovation, 23, 371-381, 2003.
Information Resources Management Association (IRMA), The 5th World Ramen Summit, Seoul, Korea, 2006.
Levitt, T., Exploit the Product Life Cycle. Harvard Business Review, 4 (Nov.-Dec), 81-94, 1965.
Little, A.D., The Strategic Management of Technology. Arthur D. Little, Cambridge, MA, 1981.
Lofaro, A., On the efficiency of Bertrand and Cournot competition under incomplete information. European Journal of Political Economy, 18, 561-578, 2002.
Liang, W.J. & Hwang, H. & Mai, C.C., Spatial discrimination: Bertrand vs. Cournot with asymmetric demands. Regional Science and Urban Economics, 36, 790-802, 2006.
Motta, M., Endogenous quality choice: price vs. quantity competition. The Journal of Industrial Economics, 41(2), 113-131, 1993.
Nieto, M. & Lopéz, F. & Cruz, F., Performance analysis of technology using the S curve model: the case of digital signal processing (DSP) technologies. Technovation, 18(6/7), 439-457, 1998.
Nagano, M., R&D investment and the government’s R&D policies of electronics industries in Korea and Taiwan. Journal of Asian Economics, 17, 653-666, 2006.
Ohinishi, K., Bertrand Games with Lifetiome Employment Contracts As A Strategic Commitment. The Manchester School, 74 (5), 549-557, 2006.
Patton, A., Top management’s stake in the product life cycle. Management Review, 18 (6), 9-15, 1959.
Polli, R. & Cook, V., Validity of the product life cycle. Journal of Business, 42 (10), 385-400, 1969.
Qiu, L.D., On the dynamic efficiency of Bertrand and Cournot equilibria. Journal of Economic Theory, 75, 213-229, 1997.
Roger, E.M., Diffusion of innovations, 3rd ed. Free press, New York, 1983.
Scherer, F.M., & Ross, D., Industrial Market Structure and Economic Performance. Houghton Mifflin, Boston, 1990.
Sutton, J., One smart agent. Rand Journal of Economics, 28(4), 605-628, 1997.
Scotchmer, S., Two-Tier Pricing of Shared Facilities in a Free Entry-Equilibrium. Rand Journal of Economics, 16, 456-472, 1985.
Singh, N. & Vives, X., Price and quantity competition in a differentiated duopoly. Rand Journal of Economics, 15(4), 546-554, 1984.
Symeonidis, G., Comparing Cournot and Bertrand equilibria in a differentiated duopoly with product R&D. International Journal of Industrial Organization, 21, 39-55, 2003.
Topology Research Institute (TRI), Perspective on TFT LCD panel display tendency in the future. TRI industrial special topic report, 39, 2005.
Vives, X., On the efficiency of Bertrand and Cournot equilibria with product differentiation. Journal of Economic Theory, 36, 166-175, 1985.
Volkswirtschaft., Product R&D Investment in a differentiated oligopoly. PH.D dissertation of Vienna University, 2003.
Wang, C.C., Competition and cooperation management analysis of TFT-LCD industry. Industrial Technology Intelligence Services, Hsinchu, 2002.
Wu, B.L., Entry and deterring strategies of Taiwan instant-noodles. Master thesis of Da Yeh University, 2004.
Yao, K. L., Entering time and model discussion of Taiwanese enterprises in the Mainland China: Case study on food industry. Master thesis of Chung Yuan University, 2003.
Yue, K. & Kouji, S., Advanced Flat-Panel Displays and Materials. MRS Bulletin, November 2002.