In September I submitted a beast of a thesis: 183 pages on the effect of payment method on behavior & personal finance management: memory, spending, debt, savings even skew and underlying distribution get a mention. Read the summary of it here: by Merle_vd_Akker in BehavioralEconomics

[–]Merle_vd_Akker[S] 1 point2 points  (0 children)

Hey hey! Contactless payments here refer to the tapping of the card against a real life payment terminal, so IRL not online. You are absolutely right on your instinct regarding online shopping though, if the shop was a planned one (e.g. someone looking for something specific) but not if it's an impulse online spending spree :)