This paper focuses on strategic trade policy in the form of export subsidies in Cournot duopoly structure for differentiated goods. Export subsidies affect social welfare in both static and dynamic situations, and the aim of this paper is to analyze and compare the welfare effects of export subsidies in one-period and multi-period games in differentiated goods markets. To analyze the welfare effects of export subsidies, a two-stage game of complete but inperfect information is considered. In the first stage, two governments determine the amount of export subsidies and in the second stage, two firms determine the Product level. The results show that, given that the firms’ competitiveness do not differ so much, export subsidies by both governments increase the firms’ profits and decrease social welfare of both countries. In an infinitely repeated game with different discount factors for both countries, and by adopting trigger strategy, we create some conditions, in which both governments commit free trade. However, if the competitiveness of one firm is so greater than the other, free trade using trigger strategy is not stable and the country with more competitive firm has incentive to deviate.

Background and Aim: What constitutes adequate dialysis has been debated in the nephrology literature over the past years. We believed that short and infrequent dialysis session contributed to poor outcome. This result provides additional evidence that (KT/V) in a flawed concept upon which to based the dose dialysis in general. Base on published evidence from many source we proposed a new index of adequacy of hemodialysis to be called hemodialysis Product (HDP).Materials and Methods: The prospective study was performed on 100 dialysis patient in the Imam hospital dialysis ward in Tehran during 2002. delivered (KT/V) and (HDP) achieved for any patient separated.Results: 100 patients including 44 female and 56 male were studied. Result has shown (KT/V) d≥l in 43% and (KT/V) d<1 in 57%. HDP in patient with (KT/V) d> 1 were ≥36. HDP in patient with (KT/V) d < 1 were < 36. Correlation between (KT/V) d and albumin was significant (p< 0.03, Albumin ≥4mg/dl). Correlation between (KT/V) d and cholesterol, hemoglobin, creatinine were not significant. Correlation between (KT/V) d and HDP was significant (p< 0.001).Conclusion: Finding above has shown that higher weekly delivered (KTN) correlate with dialysis result increase hemodialysis Product (HDP). More frequent and session dialysis results increase in HDP, provide better weekly (KT/V) d with normal albumin (show good caloric and protein intake).