Answer:
Variable expenses
Step-by-step explanation:
Generally you cannot decide your income (net or gross), you can work more hours to increase it or try to get a higher paying job, but it depends on variables that we cannot control. Otherwise everyone would choose to earn $1 million per hour or even more.
Another thing that you cannot easily control are fixed expenses, for example, you pay a fixed rent, in order to change your rent you would have to find a cheaper place.
Variables expenses are probably the only item that you can change relatively easy, for example, you can choose to buy less clothes or spend less in entertainment, etc.