Introducing a new inefficiency source due to inappropriate price selection in a Non-Competitive Environment in Data Envelopment Analysis (a case study in the Imam Khomeini Oil Refinery Company of Shazand in Iran)

Data Envelopment Analysis (DEA) is an appropriate tool for estimating various types of efficiency including Cost Efficiency (CE). Identifying and identifying inefficiency resources plays an important role in analyzing unit performance in order to plan for improving the status of Decision Making Units (DMUs). Now , if information on the inputs and outputs and pricing information of the evaluated units is available, we can calculate the lack of profit and revenue and cost optimization with respect to their inefficiencies. In this paper, we intend to determine the production possibility set (PPS) a new price and a new cost, based on which a new inefficient source and a new source selection of price vectors in a non competitive environment (that is , in the event of a possible change of loss due to the incorrect in Input prices And outputs from the Decision Making Unit to other Decision Making Units (DMUs)).