earticle

영어

Recently, the importance of natural gas is on the increase. The natural gas has become an abundant energy source because of advances in drilling technology. Specially, The development of shale gas has made traditional resources replace. Moreover, natural gas as a major energy source is much better “environment-friendly” than fossil fuels. Being used, natural gas produces and emits much less CO2 and pollutants than oils and coals. As the efficient management and use of natural gas is a meaningful topic, we focus on the efficient management of Korean city gas in terms of return on assets and capacity utilization. Accordingly, the principal aim of this paper is to measure and decompose return on assets in city gas firms. In particular, the paper confirms that change in return on assets(ROA) is influenced by productivity change, price change, change in capacity utilization, and potential asset turnover. Actually, change in ROA is decomposed using linear programming methods with thirty-one city gas firms for 2012-2014. the main empirical results for the same periods are presented being separated into two periods. Average ROA change(1.871) was decomposed into the inner factors such as average price change(1.077), average productivity change(1.146), average capacity utilization change(0.990), and average potential asset turnover(1.082), respectively for 2012-2013. ROA change was greatly dominated by productivity change. Likewise, Average ROA change(0.743) is explained by average price change (0.782), average productivity change(0.947), average capacity utilization change(1.040), average potential asset turnover (0.926), respectively for 2013-2014. In this period, ROA was greatly influenced by price change. As shown in the results, ROA is mostly influenced by productivity change, price change, capacity utilization change, and potential asset turnover. But the change of capacity utilization was not improved every year. So city gas firms need to increase ROA through the use of excess capacity and the reallocation of inputs and outputs.