An economic incentive is best described as something that

An economic incentive is something what motivated people to behave in certain way. Economic incentive give you the motivation to pursue your preferences (needs, wants and desires). 

Economic incentive is best described as something that motivates producers or consumers to take action
For example, Andy's main purpose of running his business to get as money as possible. Therefore , money is considered as his economic incentive

hope this helps

The  ancient egyptians  who  built the pyramids  may have been  able  to move massive stone blocks across the desert by wetting the sand in front of a contraption  built  to pull the heavy objects