“…Because there could be underlying deficiencies in the study design, the observed impact of digital economy on income inequality based on the benchmark regression may be coincidental. To address this concern, a placebo test was conducted following the methodology described in Ding et al [ 60 ], Cong et al [ 61 ] and Cong et al [ 62 ]. In this test, all data was removed from the sample and then randomly reallocated before re-estimating the baseline test.…”