On Thursday, October 13, Assistant Professor Marjolein Buisman presented her work on consumers' buying behaviour during the COVID-19 pandemic at the 5th meeting of the Euro Working Group on Retail Operations at Koç University, Istanbul. In this work, which is in collaboration with Professor Arnd Huchzermeier (WHU) and Professor Sander de Leeuw (Wageningen University), grocery sales data is analyzed. Preliminary results show that even though sales increased enormously at the start of the pandemic, consumers stuck to their habits and relatively soon, sales decreased again.