To discourage shoppers from using disposable plastic bags at grocey stores, they introduced
A $0.05 reward for using reusable bags
A $0.05 tax for using disposable bag
We are often more motivated by loss than by gain
See the full study here :
Homonoff, Tatiana A. 2018.“Can Small Incentives Have Large Effects? The Impact of Taxes versus Bonuses on Disposable Bag Use.”American Economic Journal: Economic Policy, 10 (4): 177-210.DOI: 10.1257/pol.20150261