Encyclopedia of Economics 2 2 2019 09 23 Ju'alah Ju'alah 1 3 3856 FA Seyed Hadi Arabi Department of Economics, Faculty of Economics and Management, University of Qom, Qom, I.R.Iran Journal Article 2019 04 30 http://enceco.ihcs.ac.ir/article_3856_ef6904152322261e01063536a72d350e.pdf