Economic volatility has been decreased over the past three decades in the world especially in type of GDP growth, as known the "Great Moderation” . There is no agreement on the causes of this. But there are three categories of causes: the good luck, good policy and structural changes hypotheses. The purpose of this research is evaluate the three hypotheses in the form of the relationship between the real GDP volatility, monetary policy index, the structural change indicator, exchange rate and oil revenues during the period of 1352-1396 in Iran. This research is using a structural vector autoregressive model (SVAR) with application of the Blanchard-Quah (B-Q) restrictions. According to the results, the impact of the monetary policy index on the volatility of production is 0. 971, the impact of the financial liberalization is 0. 1, and the revolution and war is 0. 978. The effect of monetary policy shocks on production volatility is 0. 971 which is more than two factors of good chance (oil revenue fluctuation 0. 831 and exchange rate of 0. 587) and structural change effect (capital inflow) of 0. 002. Therefore, all three categories of factors affect production volaility in Iran.

Objective To encourage innovation, the mere existence of intellectual property rights is not enough; the management and implementation of these rights are also of great importance. This is where the concept of good governance in intellectual property comes into play. The embodiment of the eight values of good governance in the patent registration system leads to the creation of an efficient and effective system. This study aims to identify the bottlenecks in Iran's patent registration system and to propose policies based on good governance to improve the efficiency and effectiveness of this system using data mining methods.Methods: To examine Iran's patent system, data collected from the database of the Intellectual Property Office of the Deeds and Properties Registration Organization has been used to analyze the changes in the number of registered patents and other available data in this field.Results: The findings indicate that the number of patents registered in Iran has experienced significant fluctuations over time, mainly due to changes in administrative and supportive policies rather than levels of innovation and development. Additionally, analyses show that the share of patents registered by legal entities in Iran is much lower than the global average. Ultimately, the validity of registered patents and the affiliations of individuals with the most patents are examined.Conclusions: Various policy recommendations have been presented, including increasing the costs of patent registration and renewal, enhancing transparency in providing information, and improving the accountability of relevant institutions to enhance Iran's patent registration system. The ultimate goal of this research is to create a suitable environment for the development of innovation and the protection of inventors' rights in line with the realization of good governance in the intellectual property system.

This paper in vestigates the relationship between free cash flow, life cycle and dividend policy in Tehran Stock Exchange listed companies during 2002-2009.Using 304 company- year and conducting OLS Regression model, results revealed that there are no significant relationship between dividend policy and free cash flow, which is not consistent with free cash flow hypothesis and the relationship with dividend policy in prior researches (Fama and French, 2001; Grullon and et al., 2002 and Deangelo and et al., 2006). The findings also reveal that there are no significant relationship between companies' life cycle and their dividend policies.