Budget: A spending plan for managing money during a given period of time.
Opportunity cost: The next best alternative given up when a choice is made.
Expense: Money spent to buy or do something.
Fixed Expenses: Expenses that do not change from month to month, such as rent.
Income: Any money earned or received (wages or gifts).
Variable Expenses: Expenses that vary from month to month, such as entertainment, car repairs, or doctor bills.