Document Type : Original Article


1 * MS. Student, University of Tehran.

2 Professor, University of Tehran.

3 Associate Professor, University of Tehran.


The purpose of this study is modeling and analyizing pricing policy of urea-ammonia Petrochemical feedstock through dynamic system approach.  The article outlines the effects of different policies and assesses the impact of each policy. To analyze and modeling system behavior based on dynamic system approach, Venssim software is applied. Having explained the problem, and choosing the approach; cause and loop diagram were identified through in-depth interviews with experts. The latter leads to scrutinizing loops and causal relationship between the variables affecting the system which includes: a selling price of urea and ammonia, discount on domestic sales, new urea and ammonia manufacturing plants. In the next step flow chart were designed, variables were formulated, and model validation was investigated under many scenarios. Finallythe impacts of different policies are studied. The results show that recent worldy decline of urea prices, justifies new projects of urea-ammonia .The profitability of the current company should set prices of feedstock below the current price. The best pricing policy that Ammonia & Urea feedstock can choose is the link between sales prices and feedstock prices, which yieldsto more precise prices while not decling the profitability.


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