The study, which involved 206 Amazon’s Mechanical Turk workers, revealed that people who make online payments and do not round up the sums were perceived as “petty” by 81% of study participants.

By contrast, people who rounded to the dollar the amount being owed were more likely to be befriended by participants. Study participants believe that exact amounts make the payments look “impersonal,” just like a business transaction is being involved.

Short-chargers were seen as “petty” if they penny-pinched their friends, i.e. paid $10 instead of $10.05.