This study analyzed the efficiency in DEA as non-parametric analysis method which commonly used in the efficiency analysis. DEA(Data envelopment analysis) is a methodology for identifying the relative efficiency of DMUs(decision making units). The problem with these research methods is that they do not provide a way to improve the efficiency up to input and output. In other words, there is a disadvantage that efficiency at various stages from input to output is not presented.
In this study One way to solve this problem is to use the network model. According to this method, the DMU has a two-stage network structure with intermediate members, In this case, the DMU has a common structure in which the output in the first stage is an input in the second stage.
In total, 73 DMUs were selected. Among them, 46 wholesale market corporations and 27 Nonghyup Gongpanjang were found. As a result, In the centralized model, the average efficiency of total DMUs’ was 0.374, which is lower than that of general CCR and SBM models. In particular, the efficiency in the first stage is 0.710 and the efficiency in the second stage is 0.513.
And the efficiency of wholesale market corporation is 0.383, which is slightly higher than the total DMUs. The efficiency in the first stage is 0.733 and the efficiency in the second stage is 0.507. Also The efficiency of the Nonghyup Gongpanjang is 0.595. In particular, The efficiency in the first stage is 0.821 and The efficiency in the second stage is 0.723, which is better than the wholesale market corporation.
Consequently, the size reduction of wholesale markets corporation and Nonghyup Gongpanjang have a significant impact in order to enable the public wholesale markets, and shows that the distribution function(second stage) is weaker than gathering capabilities.
Therefore, the strengthening of the management and support of the center-chained was higher needed. In order to solve these problems, it is necessary to manage the middle-class people and strengthen their support for them. The integrated management of the distribution management system in the public wholesale market should facilitate the utilization of meridians information for the aggregation and sharing of agricultural and marine products and rework.