It's a response to your "while the thought that inequality often harms economic activity is appealing not sure you can produce any real evidence". I just did: "the long-run (or total) effect of higher inequality tends to be negative"
Not sure that "tends" meets any standard of proof. It is what is generally known as a waffle word which usually means no actual evidence.
FY 2017 ended on 09/29/2017 with our government reporting a total debt of $20,244,900,016,053.51 FY 2018 Mo 01 debt now $20,442,473,549,889.39 a monthly change of $197,573,533,835.88 FY 2018 Mo 02 debt now $20,590,391,942,312.26 a monthly change of $147,918,392,422.87 FY 2018 Mo 03 debt now $20,492,746,546,193.75 a monthly change of −$97,645,396,118.51 FY 2018 Mo 04 debt now $20,493,729,921,939.72 a monthly change of ...... $983,375,745.97 FY 2018 Mo 05 debt now $20,855,671,542,905.95 a monthly change of $361,941,620,966.23 FY 2018 Mo 06 debt now $21,089,642,954,195.85 a monthly change of $233,971,411,289.90 FY 2018 Mo 07 debt now $21,068,200,197,433.39 a monthly change of −$21,442,756,762.46 FY 2018 Mo 08 debt now $21,145,215,185,726.27 a monthly change of ..$77,014,988,292.88 FY 2018 Mo 09 debt now $21,195,069,635,322.81 a monthly change of ..$49,854,449,596.54 FY 2018 Mo 10 debt now $21,313,061,060,202.36 a monthly change of $117,991,424,879.55 FY 2018 Mo 11 debt now $21,458,849,674,105.03 a monthly change of $145,788,613,902.67 FY 2018 Mo 12 debt now $21,516,058,183,180.23 a monthly change of ..$57,208,509,075.20 FY 2018 ended on 09/28/2018 with our government reporting a total debt of $21,516,058,183,180.23 a debt increase of $1,271,158,167,126.72