One of the basic facts of life is that people must make choices as they try to attain their goals. This unavoidable fact comes from a reality an economist calls.

scarcity is the fact that people must make choices as they try to attain their goals.

Explanation:

Scarcity is a commodity's lack of availability, and may be in consumer or commons production. Scarcity often includes a lack of resources for buying goods from a person. There is plenty to the reverse of lack. Scarcity provides limited resources than is required to fulfill human needs and desires.

so, we say that scarcity leads to dissatisfaction.

therefore the right answer is Scarcity.