A guaranteed 10-cent refund for every returned beverage container may be rational, but it is not thrilling. In British Columbia and Alberta, where bottle deposit refund systems are already well-established, researchers wondered whether adding a little uncertainty—specifically, a 0.01% chance of winning $1,000 per bottle—might nudge people to recycle more. It turns out, it does.
Across three field and lab studies involving nearly 1,000 participants, Canadians consistently preferred the lottery-style refund over the standard one, despite both having the same expected value. The appeal was not purely financial. Those who chose the slim chance at a jackpot reported higher levels of anticipatory happiness, even though few won anything substantial. The mere prospect of a windfall, however remote, was enough to boost both mood and participation.
The effect went beyond sentiment. In a randomized controlled experiment, people offered the probabilistic refund returned 47% more bottles than those in the control group. Interestingly, they also brought more non-refundable containers, suggesting heightened motivation or enthusiasm—even if not always directed accurately. The behavioral pattern mirrors findings from studies of slot machines and lotteries: unpredictable rewards can be more compelling than certain ones.
These tweaks are inexpensive to implement. Because the expected payout remains unchanged, there is no added cost to the system—just a shift in how the incentive is framed. Norway’s long-running “pantelotteri,” which links recycling with optional lottery entries, may offer a model. With U.S. recycling rates lagging and bottle return schemes often struggling for traction, policymakers might consider looking north—not just for infrastructure, but for insight into human behavior.
Perhaps encouraging recycling isn’t only about doing the right thing. It may be about making it feel a little more like play.
