Animal research has revealed a general reward system that triggers the release of the neurotransmitter.

Dopamine

Explanation:

Dopamine is a type of neurotransmitter. It is made by the brain and used in the brain in the nervous system by nerve cells. It is also called a chemical mass-anger. Dopamine is a neurotransmitter that helps us to understand how we feel happiness. It is a unique ability. It helps us in thinking, planning, focus and to find the things interesting.  

Many parts affected by dopamine such as:

1. seasonal

2. frictional unenployment

3. the number of the labor force multiplied by 100 and then subtract the number of unemployed.

4. 4%

5. an increase in prices