58 households in Philadelphia, Pennsylvania had their fruit and veg shopping monitored for 8 weeks. Half were offered a 50% discount reward on all fruit and veg purchased and half were not.

Results showed that the reward increased healthy food purchasing behavior from 6.4 to 16.7 servings of fruit and veg  on average per week per household.

Rewards come in two types: Extrinsic and Intrinsic. 

‍Extrinsic rewards are economic: pay, discounts, working conditions, gold stars, healthcare, promotions etc. 

Intrinsic rewards are emotional, coming from a sense of achievement through skill and hard work, unplanned verbal praise from authority figures, and peer recognition.

Too much extrinsic will lessen internal motivation as it’s seen as controlling, especially if they’re later removed (Murayama et al., 2010). Ensure that they’re significant enough to motivate against task boredom (Hidi, 2015) and are in line with the market needs of employees / customers.

Focus on rewarding intrinsically - seen as a superior reward (Deci et al., 1999) - with greater levels of trust, choice and freedom to make one’s own decisions. You’ll be rewarded with a more motivated, loyal following as a result.