"Nudging is particularly effective at shaping one-off behaviors, such as getting flu shots, but it hasn’t yet been shown to be as reliably effective at changing

"Nudging is particularly effective at shaping one-off behaviors, such as getting flu shots, but it hasn’t yet been shown to be as reliably effective at changing decisions that require daily actions," Makes sense: daily actions have emerged from extensive exposure to competing nudges that continue and have culminated in producing the current behavior. When you add your one nudge, it may get some attention as something novel, but then it will be overwhelmed.