The government offers low-interest loans to people who build solar homes. this is an example of

The government offers low-interest loans to people who build solar homes. this is an example of  economic incentive

Economic incentive is a form of financial aid that motivates a person or a group to perform a specific action.
from this case, we can see that  the government tried to motivate people to use solar homes (which will be friendly to the environment) by offering them a low interesst0rate