List of Articles External costs Open Access Article Abstract Page Full-Text 1 - Estimation of Shadow Price and External Cost of Groundwater Salinity in Agricultural Sector Fatemeh Abolghasemi Hamed Najafi Alamdarlo Seyed Abolghasem Mortazavi 10.22034/jest.2019.44167.4654 Open Access Article Abstract Page Full-Text 2 - Optimization model for production productivity considering the external costs of Co2 emission in the kiln Department of cement factory (case study) Ahmad Naghiloo Sajjad Emami Ata chitsaz khoie Mohammad Fathaliloo