Preface: Advances of OR in commodities and financial modelling

The Annals of Operations Research invited submissions of papers to a special volume on Advances of OR in Commodities and Financial Modelling, on the occasion of the 55th Meeting of EWGCFM (EWGCFM 2015; http://ewgcfm2015.iam.metu.edu.tr/index.html), which was organized by the Institute of Applied Mathematics (IAM; http://iam.metu.edu.tr/) of Middle East Technical University, EURO Working Group “Commodities and Financial Modelling” (EWGCFM; http://www.ewgfm.eu/), and The Association of European Operational Research Societies (EURO; http://www.euro-online.org/). This conference took place on the campus of METU (http://www.metu.edu.tr/) in Ankara, Turkey, during May 14–16, 2015. The participants of EWGCFM 2015 as well as other researchers in the area were welcomed to submit their recent research achievements