What is a household? Its features and needs
A household is one person or a group of people who live together and share money for daily life. In economics households are consumers (they buy goods and services) and also suppliers (they sell their work, lend savings, pay taxes).
Households have needs (food, water, housing, clothes, health care, education, transport) and wants (eating out, a bigger TV, holidays). Needs come first. What a household needs depends on its size, the age of its members and where it lives.
Sources of household income
- Income from work: wages and salaries.
- Income from a business or self-employment: profit from a shop, a farm, freelance work.
- Income from property: rent from a house, interest from a bank deposit, dividends from shares.
- Transfer income: pensions, child benefit, scholarships, money sent by relatives.
Gross income is before tax; net (disposable) income is what is left after taxes and compulsory deductions. A budget uses net income.
Household spending: fixed and variable
Fixed expenses stay the same each month: rent, school fees, insurance, loan instalments (EMI), phone plan.
Variable expenses change: food, electricity, fuel and travel, clothes, outings.
When income rises, families spend a smaller share of it on food and a bigger share on education, health and leisure.
Making a personal and family budget
- Write all expected net income for the month.
- List fixed expenses, then estimate variable ones.
- Find the balance: income − spending.
- Surplus: save it or pay off debt. Deficit: cut wants, find extra income, or (carefully) borrow.
- At the end of the month compare the plan with what really happened and adjust.
One simple guide is the 50/30/20 rule: about 50% on needs, 30% on wants, 20% on savings. A personal budget (for one person, such as a student's pocket money) works the same way.
Keep an emergency fund of a few months of needs for job loss or illness.
Choices and opportunity cost
Money, time and energy are scarce, so a household must choose. The opportunity cost of a choice is the value of the next best alternative given up.
Example: a family has 20,000 left. It can buy a new phone or put the money towards a child's coding course. If it buys the phone, the opportunity cost is the course. Good choices compare benefits and costs, think about the future (saving and interest) and put needs before wants.
Try it
In the 3D, push the "Wants" slider up until the savings jar is empty. What happens if you go further? At home: write down your own (or your family's) income and spending for one week. Mark each item F (fixed) or V (variable) and N (need) or W (want). Is there a surplus?
Key formulas and definitions
- Budget balance = total income − total spending
- Surplus: income > spending; balanced: income = spending; deficit: income < spending
- Savings rate = savings ÷ income × 100%
- Net (disposable) income = gross income − taxes and deductions
- 50/30/20 guide: needs 50%, wants 30%, savings 20%
- Opportunity cost = value of the next best alternative given up
Worked examples
1. A family earns 30,000 from salary, 5,000 from rent and 1,000 interest a month. Find total income.
30,000 + 5,000 + 1,000 = 36,000 a month.
2. Income 36,000; fixed spending 12,000; variable spending 14,000. Find the balance.
Spending = 12,000 + 14,000 = 26,000. Balance = 36,000 − 26,000 = 10,000 surplus.
3. The same family's variable spending rises to 26,000 in a festival month. What happens?
Spending = 12,000 + 26,000 = 38,000. Balance = 36,000 − 38,000 = −2,000, a deficit. They must use savings or cut wants.
4. Use the 50/30/20 rule on a net income of 40,000.
Needs 50% = 20,000; wants 30% = 12,000; savings 20% = 8,000.
5. A student gets 1,500 pocket money a month and saves 300. Find the savings rate.
300 ÷ 1,500 × 100% = 20%.
6. Gross salary is 50,000; tax and pension deductions are 6,000. Spending is 39,000. Find disposable income and the monthly saving.
Disposable income = 50,000 − 6,000 = 44,000. Saving = 44,000 − 39,000 = 5,000.
Common mistakes
- Planning with gross income instead of net income after tax.
- Forgetting irregular costs (yearly fees, festivals, repairs) that make one month go into deficit.
- Treating every want as a need.
- Thinking opportunity cost is the price paid; it is the best alternative given up.