Due to a combination of sales regulations and lack of innovation, the growth of large marts is stagnating and profitability is deteriorating. Accordingly, this study examined the impact of large smarks on the national economy, especially on production, added value, employment, sales of suppliers, and tax revenues, through industry correlation analysis and other algebraic calculations. As a result of inter-industry analysis, large marts increase the annual production, added value, and employment by KRW 10 trillion, KRW 11 trillion, and 210,000 people in the wholesale/retail and product brokerage service industries, respectively, and by KRW 43 trillion, KRW 38 trillion, and 320,000 people, respectively, in the industry as a whole. In addition, large marts increase supplier sales by KRW 14 trillion per year and tax revenues by KRW 917.3 billion per year (corporate tax KRW 264.5 billion + value-added tax KRW 652.8 billion). Therefore, it can be said that the impact of large marts on the national economy is truly enormous. Therefore, the government needs to help large marts become competitive by reevaluating populist regulations on large marts that are not helpful to the national economy and open the way for large marts to provide better products and services. In addition large marts need to demonstrate its entrepreneurial spirit and innovate in products and services so that people continue to visit the large marts.