Year 9 Economics & Business · Economics and Business · 9m read

Money, Banking and Financial Decisions

Ever wondered why your parents stress about interest rates or why some people seem to build wealth while others struggle? Money and banking are the systems that let you earn, save, and grow your wealth — and mastering them now means you'll make smarter choices about loans, investments, and your future. Whether you're saving for something you want or understanding why your pocket money doesn't stretch as far, these skills directly shape your financial freedom.

Learning objective: Explain how money and banking work and apply financial literacy to personal decisions.

By the end of this lesson you can:

• I can describe the role of money and banks.
• I can explain interest rates and their effect.
• I can make informed financial decisions about saving, spending and borrowing.

Money choices are seeds. Spend now and enjoy it today, or plant it (save/invest) and harvest more later. Interest is the growth.

Money, banks and financial choices

FUNCTIONS OF MONEY:
1. MEDIUM OF EXCHANGE — accepted for goods and services.
2. STORE OF VALUE — can be saved for future use.
3. UNIT OF ACCOUNT — standard measure for prices and debts.

BANKS:
• Accept deposits, pay interest.
• Lend money, charge interest.
• Profit = spread between lending rate and deposit rate.
• RESERVE BANK OF AUSTRALIA (RBA): Australia's central bank.
– Sets the CASH RATE (base interest rate).
– Controls inflation target (2-3%).

INTEREST RATES AND THE ECONOMY:
• RATE UP → borrowing costs more → less spending/investment → slows economy.
• RATE DOWN → borrowing cheaper → more spending → stimulates economy.
• Cash rate affects mortgages, car loans, savings rates.

PERSONAL FINANCIAL DECISIONS:
• BUDGET: income vs expenses; surplus or deficit.
• SAVING: compound interest makes early saving powerful.
– $1,000 at 5% for 40 years = ~$7,040.
• DEBT: credit cards, buy-now-pay-later — high interest rates = expensive.
• SUPERANNUATION: compulsory employer contributions (currently 11%) — your future.
• INSURANCE: protects against financial shocks.

KEY CONCEPTS:
• INFLATION: general price rise erodes purchasing power of money.
• REAL vs NOMINAL: real interest rate = nominal rate minus inflation.
• DIVERSIFICATION: don't put all eggs in one basket.

AARI TIP: Ask Aari to help you create a personal budget or explain compound interest with numbers.

Financial principles

• Pay yourself first: Save before you spend, not after.
• Compound interest: The earlier you save, the more it grows.
• High-interest debt: Credit card debt at 20%+ should be prioritised for repayment.

Quick reference

| Product | Feature |
|---|---|
| Savings account | Earns interest |
| Credit card | Borrowing; high interest |
| BNPL | Pay later; fees if late |
| Loan | Repay with interest |
| Scams | "Too good to be true" offers |

Worked example (Medium)

How does a rise in the RBA cash rate affect households with a mortgage?

1. Cash rate rises. RBA increases cash rate from 4.10% to 4.35% (e.g., 2023 increases).
2. Banks respond. Banks raise their variable mortgage rates by a similar amount.
3. Household effect. Monthly mortgage repayments increase. A $500,000 mortgage at 6% vs 6.25% = ~$80+ more per month.
4. Spending. Households have less discretionary income → reduce spending on other goods and services → economic activity slows.

Answer: RBA rate rises work through mortgage costs to reduce household spending, slowing demand and inflation — the intended mechanism.

Worked example (Hard)

A Year 9 student earns $200/week from a part-time job. They want to buy a $1,200 laptop. Compare the financial outcomes of: (a) saving for 6 weeks, (b) using buy-now-pay-later (BNPL) to purchase immediately, and (c) using a credit card.

1. Option A: Save for 6 weeks. Save $200/week for 6 weeks = $1,200. Total cost = $1,200. Delay: 6 weeks but no interest or fees. If saved in a high-interest account (e.g., 5% p.a.), they might earn ~$3 in interest — negligible but positive.
2. Option B: Buy-now-pay-later. Receive the laptop immediately. Pay 4 fortnightly instalments of $300. Total cost = $1,200 IF payments are on time. Late fees: typically $10-$15 per missed payment, accumulating quickly. If one payment is missed: total could become $1,210-$1,215. Risk: spending money before it's earned creates budget pressure.
3. Option C: Credit card. Purchase immediately on a credit card at 20% p.a. interest. If only minimum repayments (~$25/month) are made, the laptop could take 5+ years to pay off and cost over $1,600 total. Even paying $200/month, the total cost would be ~$1,260 due to interest.
4. Analysis. Saving is cheapest but requires patience. BNPL is free IF disciplined but risky if payments are missed. Credit card is the most expensive option and creates a dangerous debt trap. The "cost" of each option includes both money and opportunity cost (what else the money could do).

Answer: Financial decisions involve trade-offs between time, cost and risk. Saving is cheapest; BNPL is convenient but risky; credit card debt is expensive. Understanding these trade-offs is a fundamental life skill.

Common mistakes

• Thinking buy-now-pay-later (BNPL) is "free money." BNPL services like Afterpay are free only if you pay every instalment on time. Late fees accumulate quickly, and the temptation to overspend is real — ASIC found that 20% of BNPL users miss at least one payment. Fix: Explain the true cost: "BNPL is interest-free but not risk-free. Late fees and the temptation to overspend can make it more expensive than saving, especially for people on tight budgets."
• Confusing simple and compound interest. Simple interest is calculated only on the original amount. Compound interest is calculated on the original amount PLUS accumulated interest — which is why savings grow faster over time and debt can spiral. Fix: Distinguish: "Simple interest = same amount each period. Compound interest = interest on interest, which accelerates growth (good for savings) or debt accumulation (bad for borrowing)."
• Saying the RBA "prints money to cause inflation." The RBA's primary tool is the cash rate (interest rate), not money printing. While quantitative easing (2020-22) did expand the money supply, the RBA's normal operations focus on setting interest rates to influence borrowing, spending and inflation. Fix: Describe the mechanism: "The RBA manages inflation primarily by adjusting the cash rate. Higher rates reduce borrowing and spending, lowering inflation. Lower rates stimulate borrowing and spending."

The Psychology of Financial Decisions — Why We're Bad With Money

Traditional economics assumes people make rational financial decisions. Behavioural economics (pioneered by Daniel Kahneman and Richard Thaler, both Nobel laureates) shows we systematically don't — and understanding why can make you better with money.

Present bias: Humans strongly prefer rewards now over larger rewards later. This is why saving is hard and spending is easy — our brains are wired to value immediate gratification. BNPL services exploit this tendency.

Loss aversion: Losing $100 feels about twice as painful as gaining $100 feels good. This makes people overly cautious with investments (selling winners too early, holding losers too long) and reluctant to switch banks or providers even when better deals exist.

Anchoring: The first number you see influences your judgement. A "was $200, now $99" sign makes $99 feel like a bargain — even if the item was never worth $200. Retailers use anchoring constantly.

Mental accounting: People treat money differently depending on its source. A $50 tax refund might be "fun money" to spend, while $50 from wages feels like it should be saved — even though both are identical in value.

Practical applications for Year 9:
- Set up automatic savings transfers (removes the decision point where present bias strikes)
- Wait 48 hours before any purchase over $50 (reduces impulse buying)
- Compare the TOTAL cost of borrowing, not just the monthly payment
- Understand that sales and "limited time offers" are designed to override your rational thinking

Practice questions

1. The Reserve Bank of Australia's primary tool for managing inflation is:

   1. Setting income taxes
   2. Printing money
   3. Setting the cash rate
   4. Controlling superannuation

   (1 marks)

2. Explain why starting to save early in life has such a large impact on eventual wealth.

   (3 marks)

Summary

• Describe the role of money and banks.
• Explain interest rates and their effect.
• Make informed financial decisions about saving, spending and borrowing.