Behavioral spillovers from food-waste collection in Swedish municipalities

We estimate behavioral spillovers from environmental policy within the context of a natural experiment on food waste in Sweden. Exploiting the staggered implementation of food-waste collection across Swedish municipalities, we use a difference-in-difference design to measure the causal effect of introducing such collection on another pro-environmental behavior, namely the sorting of packaging waste. Results suggest a positive spillover effect on packaging waste which corresponds to 5-10% of the population average and rises gradually over time, possibly due to slow implementation of food-waste collection in many municipalities. These estimates are unconfounded with a number of shifts in the waste-related incentives facing households, e.g. introduction of curbside collection of packaging waste from single-family homes. Although we are unable to directly account for all such factors, indirect robustness tests provide no compelling evidence that estimated spillovers are spurious.