The Relationship between Economic Structural Changes and Tax Structure Changes: Lessons to Tax Policy- making
                        
                        
                        
                        
                        Analyzing the Performance, Collection Efficiency and Implementation Challenges of Value Added Tax in Iran
                        
                        
                        
                        
                        Estimating the Policy Gap and the Compliance Gap in Iran's Value-added Tax System and the Need to Extract a Rational Framework for Granting Exemptions
                        
                        
                        
                        
                        The Effect of Financial and Monetary Shocks on the Iranian Taxation System along with Determining Optimal Tax Rates of Consumption, Salary and Wages (General Equilibrium Approach using Genetic Algorithm)
                        
                        
                        
                        
                        Understanding Tax Policy-making Process in Iran: Factors Affecting Tax Agenda setting Process at the National Level and its Actors