List of Articles L10 Open Access Article Abstract Page Full-Text 1 - The Effect of OPEC Statements on Fluctuations in Crude Oil Prices Fariba Shahbodaghlou Aliasghar Esmaeilnia gatabi azadeh mehrabian ROYA SEIFIPOUR 10.30495/eco.2020.674206 Open Access Article Abstract Page Full-Text 2 - To Analyze Entry Barrier and Price in the Industry of Custom-Purpose Applications Kiumars Shahbazi jalil badpeyma Open Access Article Abstract Page Full-Text 3 - The Relationship between Efficiency and Industrial Concentration of Food and Beverage Industries in Iran K. soheili SH. Fattahi M.S zabihi dan M. hadizadegan Open Access Article Abstract Page Full-Text 4 - Inter-fuel Substitution in OECD and its Effects on the Fluctuations of Iran's Petroleum Exports teymoor mohammadi hamid amadeh fereidoon barkashli dariush vafinajar Open Access Article Abstract Page Full-Text 5 - A Survey of Fractal Market Hypothesis with the Markov Regime change model in the Tehran Stock Exchange یعقوب محمودی فریدون رهنمای رودپشتی شادی شاهوردیانی حمیدرضا کردلویی مهدی معدنچی زاج Open Access Article Abstract Page Full-Text 6 - Providing a model for formulating export development strategies in foreign markets using data-driven method (Case study of Iranian petrochemical companies) محمدعلی مناف زاده هیر رضا شافعی عادل فاطمی 10.30495/fed.2021.687917