Figure 4
From: Dark Web Marketplaces and COVID-19: before the vaccine
Longitudinal analysis of DWM activity. (a) Seven-days rolling average of active listings mentioning COVID-19 and COVID-19 specific listings. (b) Seven-days rolling average of the observed COVID-19 specific listings in the medicines and PPE categories. Black dashed vertical lines in panels (a) and (b) corresponded to significant COVID-19 world events, see Appendix C. (c) Seven-days median price with 95% confidence interval for COVID-19 specific listings. (d) Seven-days median price with 95% confidence interval for active COVID-19 specific listings in the PPE and medicines categories