NEW YORK: More than certain rewards, uncertainty motivates people to put in more efforts, new research has found. These findings can help companies and public policy makers when designing incentive systems.

"Introducing a bit of uncertainty can help to motivate people and make the effort required to achieve a reward seem more like a game and less like work," said the researchers.

"When comparing the time, money, and effort people invest in order to qualify for either a certain or an uncertain reward, we find that the uncertain reward is more motivating than the certain reward," said Ayelet Fishbach from University of Chicago Booth School of Business.

In one study, consumers were asked to drink a large amount of water within two minutes. Some were told they would receive a guaranteed reward of two dollars, while others were told they would receive either one or two dollars (decided by a coin toss).

Even though the reward was potentially lower, more consumers completed the task when the reward was uncertain. In another study, consumers were asked to bid against each other for a bag of chocolates.

Some were told there were four chocolates in the box, while others were told there were either two or four. Consumers bid higher when they did not know how many chocolates were in the bag.

"The idea that uncertainty can increase motivation is counterintuitive, but its underlying mechanism is not," said the authors.

"Consider the experience of slowly unwrapping a gift. Getting closer to finding out what is in the box is exciting and this excitement motivates action," they explained in the study that appeared in the Journal of Consumer Research.

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