家得宝和美国劳氏公司是全球最大的两家家居建材零售企业。为了分析二者在重大事件冲击下是处于竞争关系还是处于相同的困境，本文将基于两家公司1996~2021年的收入和利润数据，利用明显的结构断点并结合事件研究法，对明显结构断点所处时间节点上对应发生的重大事件进行实证研究，通过比较在同一重大事件冲击下两家公司的收入、利润的变化状况，从而判断两家公司之间的关系。研究结果表明，重大事件的种类较多，存在重大事件的外部冲击会影响整个家居建材零售行业的发展，从而使两家公司的经营都受到负面影响，处于相同的困境;存在对两家公司共同造成内部影响的重大事件，促使双方积极调整内部业务，处于竞争关系；存在只影响个别公司的事件，对另一家公司并无直接影响；存在的确发生的重大事件但对公司的营收基本不产生影响。

关键词：平稳性检验、单位根检验、结构断点、事件研究法

Home Depot and Lowe's are two of the world's largest home building materials retailers. In order to analyze whether the two are in a competitive relationship or in the same dilemma under the impact of major events, this paper will use the structural breakpoints combined with the event research method to conduct an empirical study corresponding to the major events at the time node where the obvious structural breakpoints are located. Based on the revenue and profit data of the two companies from 1996 to 2021, the relationship between the two companies is compared along with impact of the same major event. The results show that there are many types of major events, and the external ones will affect the development of the entire home building materials retail industry, so that the operations of both companies are negatively affected and are in the same predicament; There are major events that jointly have an internal impact on the two companies, prompting both parties to actively adjust their internal business and be in a competitive relationship; There are events that affect only individual companies and have no direct impact on another company; There are significant events that do occur but have little impact on the company's revenue.

Keywords: Stationarity Test, Unit Root Test, Structural Breakpoint, Event Study Method