关键词: 效用模型, 异质性消费者, 关税, 决策

Abstract: Based on the heterogeneous consumers, we study the influence of tariff ratio adjustment on the precious jewelry dealer decision-making process. Under the constraints of Individual Rationality(IR)and Incentive Compatibility(IC), the demand functions based on heterogeneous consumer utility is formed, with an aim to analyze the dealer's optimal decision-making behaviors in different markets. In addition, the influence of consumer's price sensitivity on social welfare is considered, and the optimal tariff ratio levels are analyzed as well. The findings show that firstly, both the tariff ratio and the consumer's price sensitivity jointly affect the precious jewelry dealer's decision-making behaviors. Secondly, on the premise of certain consumer price sensitivity there exists a specific range of tariff ratios, within which the whole precious jewelry market can be controlled by the government to maximize the social welfare. Finally, when the level of tariff ratio is fixed, the type of the precious jewelry market is affected by the consumer price sensitivity mainly.

Key words: utility model, heterogeneous consumer, tariff, decision-making