فهرس المقالات Economics and finance حرية الوصول المقاله صفحة الملخص نص كامل 1 - Why Linear (and Piecewise Linear) Models Often Successfully Describe Complex Non-Linear Economic and Financial Phenomena: A~Fuzzy-Based Explanation Hung Nguyen Vladik Kreinovich 10.30495/tfss.2023.1972564.1054