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21世纪，数字经济成为重组要素资源、重塑经济结构、改变竞争格局的关键力量，逐渐渗透于经济社会发展的各领域全过程。“国内大循环为主，国内国际双循环”新发展格局的提出，揭示着数字经济在新发展格局中已处于不可或缺的重要环节。数字经济以居民消费升级为契机，满足居民对消费品高质量要求，从而助推国内大循环构建，释放经济增长活力。

本文从数字经济影响居民消费的直接效应和间接效应两个方面展开研究。数字经济通过缓解信息不对称、强化示范效应及创造产品新供给端等方式精准定位消费需求，促进居民直接消费；通过积累人力资本和社会资本、提升区域流通效率、激发企业创新动力及促进产业集聚和产业融合等方式提升居民收入间接影响居民消费。机理分析研究表明数字经济促进居民消费，其中居民收入是数字经济影响居民消费的中介变量。在数字经济和居民消费的现状分析中，随着数字经济不断发展，区域间数字经济发展差距逐渐缩小，高值地区增速放缓，低值地区增速提升，但区域间数字效能存在明显的“马太效应”。人均消费支出中，居民消费总体呈上升态势，东部地区人均消费支出高于全国均值，东北、中部和西部地区均低于全国均值，且各地区居民消费类型支出存在差异性。本文利用散点图和拟合曲线进一步研究发现：数字经济和居民消费存在正向相关性，居民消费随着数字经济发展水平的提升而增加。最后，通过构建计量模型实证检验数字经济和居民消费的内向联系。研究结果表明：一是数字经济对居民消费具有显著的促进作用，且农村居民消费影响系数高于城镇居民，通过稳健性检验和工具变量检验，该结论依然成立。二是中介效应回归结果显示，从全国层面看，数字经济通过促进居民收入增长带动居民消费提升，居民收入在这一过程存在完全中介效应，且城镇居民中介效应回归结果与该结果一致；农村居民收入在数字经济促进居民消费提升过程中中介效应并不显著。此外，数字经济对居民收入的影响效应显著为正，城镇居民的促进作用大于农村居民。三是在数字经济影响城乡居民消费支出的区域异质性分析中，东部城乡居民消费支出促进作用均显著，中西部地区数字经济对农村居民消费支出具有显著促进作用，东北地区城镇和农村居民消费支出影响系数均不显著。在居民消费类型异质性分析中，数字经济对生存型、发展型及享受型居民消费支出影响系数均显著，城镇居民生存型消费支出高于农村居民，发展型和享受型消费支出则恰好相反。

In the 21st century, the digital economy has become a key force for reorganizing factor resources, reshaping economic structure, and changing the competitive pattern, and gradually penetrates into the whole process of economic and social development. The proposal of the new development pattern of "domestic circulation as the mainstay, domestic and international dual circulation" reveals that the digital economy has become an indispensable and important link in the new development pattern. The digital economy takes the upgrading of residents' consumption as an opportunity to meet residents' requirements for high quality of consumer goods, thereby promoting the construction of domestic circulation and releasing the vitality of economic growth.

This paper studies the direct and indirect effects of the digital economy on household consumption. The digital economy precisely locates consumer demand and promotes direct consumption by residents by alleviating information asymmetry, strengthening demonstration effects, and creating new supply sides of products. By accumulating human and social capital, improving regional circulation efficiency, stimulating enterprise innovation power, and promoting industrial agglomeration and industrial integration, residents' income will be increased and indirectly affect residents' consumption. Mechanism analysis shows that the digital economy promotes household consumption, and household income is the mediating variable of the digital economy affecting household consumption. In the analysis of the current situation of digital economy and household consumption, with the continuous development of the digital economy, the gap between regions in the development of the digital economy has gradually narrowed, the growth rate of high-value regions has slowed down, and the growth rate of low-value regions has increased, but there is an obvious "Matthew effect" in interregional digital efficiency. Among the per capita consumption expenditure, the per capita consumption expenditure of residents showed an overall upward trend, the per capita consumption expenditure in the eastern region was higher than the national average, and the northeastern, central and western regions were lower than the national average, and there were differences in the consumption type expenditure of different regions. This paper uses scatter plot and fitting curve to further find that there is a positive correlation between digital economy and household consumption, and household consumption increases with the improvement of digital economy development level. Finally, the inward relationship between digital economy and household consumption is empirically tested by constructing a quantitative model. The results show that, first, the digital economy has a significant role in promoting household consumption, and the impact coefficient of rural residents' consumption is higher than that of urban residents. Second, the results of the regression of the intermediary effect show that from the national level, the digital economy promotes the growth of residents' income to increase residents' consumption, and there is a complete mediation effect in the process of residents' income, and the regression results of the intermediary effect of urban residents are consistent with the results. The intermediary effect of rural residents' income in the process of digital economy promoting residents' consumption is not significant. In addition, the impact of the digital economy on residents' income is significantly positive, and the promotion effect of urban residents is greater than that of rural residents. Third, in the analysis of the regional heterogeneity of the impact of the digital economy on the consumption expenditure of urban and rural residents, the promotion effect of consumption expenditure of urban and rural residents in the east is significant, the digital economy in the central and western regions has a significant role in promoting the consumption expenditure of rural residents, and the impact coefficient of consumption expenditure of urban and rural residents in the northeast region is not significant. In the analysis of the heterogeneity of household consumption types, the impact coefficient of digital economy on subsistence, development and enjoyment household consumption expenditure was significant, and the survival consumption expenditure of urban residents was higher than that of rural residents, while the development and enjoyment consumption expenditure were the opposite.