The cost efficiency is one of the types of the used efficiency concepts in the data envelopment analysis (DEA). In the literature of the cost efficiency, the prices are often applied to the units in a fixed and linear form, while in some cases, as the subjects of the savings and observance of the consumption patterns, the prices are usually considered in terms of stepwise (piecewise linear) and not fixed (linear). This paper proposes the new models to evaluate of the cost efficiency in the fully competitive setting by using the costs in a piecewise linear form. The models are developed for the non-fully competitive and integer-valued inputs cases. Finally, the proposed models are used to determine the cost efficiency of the confectioneries in Islam Abad Gharb city from Iran country in the case study.

成本效率是数据包络分析（DEA）中使用的效率概念的类型之一。在成本效率的文献中，价格通常以固定和线性的形式应用于单位，而在某些情况下，作为节约和遵守消费方式的主题，价格通常是逐步考虑的。 （分段线性）和不固定（线性）。本文提出了一种新模型，通过使用分段线性形式的成本来评估完全竞争环境下的成本效率。这些模型是针对非完全竞争和整数值输入案例而开发的。最后，在案例研究中，所提出的模型用于确定来自伊朗国家的伊斯兰阿巴德加尔布市糖果的成本效率。