買方—賣方網路：環狀市場模型分析

Abstract

訊息強度為廠商非價格競爭的重要變數，本文以Kranton & Minehart (2001)的買方—賣方理論模型為基礎，假設長度為2n的環狀市場模型，廠商皆透過訊號發送告知消費者商品訊息，並作利潤極大化訂價。在寡占產業的結構下，討論並比較廠商於齊質及異質的情況下產業均衡之價量決策。消費者除考慮商品價格外，基於運輸成本的考量，必然向距離本身較近者購買。此外，於商品訊息之傳遞過程中，消費者彼此之間不作訊息傳遞，並依效用極大化原則決定購買行為。

Information intensity is an important variable of non-price competition between firms, the thesis is based on Kranton & Minehart (2001) buyer-seller networks, consider a circular market with 2n unit in length. Firms inform consumer through releasing information about commodity, and set up prices to maximize profit. We discuss and compare the two cases of homogeneous and heterogeneous firms’ decisions over equilibrium prices and quantity in the oligopolistic industry. The consumers should consider, prices and transportation cost, so that they would buy commodities from the nearest firm. Furthermore, in the process of delivering information, consumers do not inform each other, and make decisions in accordance with the principal of utility maximization.