How money, markets and interest rates actually work — in plain English, built up from first principles. New to a term? See the plain-English glossary. Want to run the numbers? Try the free calculators.
An interest rate is simply the price of money — the rent you pay to borrow it, or earn for lending it. Money has a price because people prefer cash now over cash later, and lenders want compensation for the wait and the risk that they may not be repaid. Australia's central bank, the Reserve Bank (RBA), sets the "cash rate" — the base price banks charge each other for overnight loans. Move it, and other prices of money tend to follow: mortgages, savings, business loans. Cheaper money encourages borrowing and spending, which tends to lift prices and asset values. Dearer money does the reverse.
Why it matters for your money: RBA lifts the cash rate → banks charge more for loans → repayments on variable-rate mortgages rise and new borrowing slows → house prices and shares tend to cool → less money in your pocket and in your portfolio (your investments)
Related tool: Mortgage repayment calculator →
A government bond is a loan you make to a government. You hand over, say, $100, and in return you're promised fixed payments — for example $4 a year — plus your $100 back on an agreed end date. That $4 is locked in for the life of the bond. Here's the seesaw. Imagine you own a bond paying $4 a year. Suddenly, new bonds pay $5. Nobody wants your stingy $4 one, so to sell it you must drop the price. As your bond's price falls, that $4 becomes a bigger slice of what a buyer pays — so the yield (your return) rises. Price down, yield up. Always.
Australia's 10-year government bond yield is a key gauge of longer-term borrowing costs, which feed into things like fixed home loan rates. (Variable mortgage rates, by contrast, track the Reserve Bank's cash rate.) Globally, the US 10-year Treasury is the main reference rate — the "safe" return much else is measured against.
Why it matters for your money: US 10-year Treasury yield rises → global long-term "safe" return repriced (moves to a new level) → Australian banks' wholesale funding costs rise → fixed mortgage rates lift → your repayments and house-buying power are affected
Related tool: Compound interest calculator →
A bond is a loan you make to a government for a set time; the regular interest it pays, measured against its price, is the "yield." The yield curve plots those yields across maturities, from short loans (months) to long ones (years). Usually the curve slopes up: locking your money away longer tends to earn more, as reward for the wait and added uncertainty. An inverted curve slopes down, where short loans pay more than long ones. That is unusual, and it often means investors expect the economy to weaken and central-bank rates to fall ahead, so they buy long-term bonds now to lock in today's higher yields.
Why it matters for your money: Investors expect a slowdown → buy more long-term bonds → demand pushes long yields below short yields (curve inverts) → borrowing can get tighter and confidence may dip → hiring and spending can slow → this can touch your job, mortgage rate and super returns
Related tool: Compound interest calculator →
Inflation means money slowly loses buying power: the same $50 buys less over time. To measure it, the Australian Bureau of Statistics tracks a "basket" of things households buy — groceries, rent, petrol, haircuts — and checks how its total price changes. That's the Consumer Price Index (CPI). Some prices swing wildly (petrol, fruit), so a "trimmed mean" sets aside the most extreme movers, both up and down, to show the steadier underlying trend. When inflation runs hot, the Reserve Bank lifts its main interest rate, the "cash rate": borrowing costs more, people spend less, demand cools, and price rises ease.
Why it matters for your money: RBA notices high CPI → lifts the cash rate (its main interest rate) → banks pass this on, so your variable mortgage repayment jumps (and savings interest rises too) → with a bigger repayment, less cash is left to spend each month
A central bank is the country's money manager. Australia's is the Reserve Bank of Australia (RBA); America's is the Federal Reserve (the Fed). Their job: keep prices stable (low, steady inflation — the rate at which prices rise) and people employed. Their main lever is the policy rate (the interest rate they set, called the cash rate in Australia), which ripples into other borrowing costs. Think of it like a thermostat for spending. Too hot, prices climbing fast? Raise the rate, borrowing costs more, people spend less, prices cool. Too cold, jobs scarce? Lower it, borrowing cheapens, spending warms up.
Why it matters for your money: RBA raises the policy rate (the cash rate) → banks lift mortgage & loan rates → repayments on variable-rate loans rise and spending tightens → your monthly budget, savings interest & house value
Australia digs up and sells huge amounts of iron ore, coal, and gas to the world. These are "commodities" — raw materials sold in bulk by the tonne. Think of Australia as a giant farm stall. When buyers like China want its produce, they often must swap their own money for Australian dollars to pay local miners. More buyers wanting AUD tends to push its price up, much like a crowded stall lets a seller charge more. Because commodities are priced in US dollars worldwide, rising prices usually mean more income flowing to Australia, lifting demand for the AUD. When demand fades, the AUD tends to fall.
Why it matters for your money: Global growth lifts demand for iron ore, coal, and gas → higher US-dollar commodity prices → buyers often swap their currency for AUD to pay Australian miners → demand for AUD tends to rise → a higher AUD means your savings can buy more overseas, and Australian mining shares may benefit
Iron ore is the rock that gets smelted, with coking coal, into iron and then steel. China makes roughly half the world's steel for apartment towers, bridges and cars, and Australia is the largest, lowest-cost supplier feeding it, which is why iron ore is our number-one export. Think of China as a giant bakery and iron ore as flour: when the bakery is busy it buys more flour and pays more for it. So when China builds heavily, miners like BHP, Rio Tinto and Fortescue earn bigger profits, the higher export income tends to lift the Australian dollar (AUD), and Canberra collects more company tax, helping the federal budget.
Why it matters for your money: China steel demand -> iron-ore price -> miners' profits, export income (AUD) & company tax -> your shares, the Australian dollar, and the federal budget
Imagine a party with two doors: a dance floor (exciting, risky) and a quiet corner (safe, dull). "Risk-on" is when the crowd feels brave and rushes to the dance floor; "risk-off" is when they get nervous and pile into the corner. Markets do this with money. When confident (risk-on), investors tend to buy shares and riskier currencies like the Australian dollar (AUD), and lean away from "safe-haven" assets. When scared (risk-off), they often sell shares and the AUD and crowd into havens: high-quality government bonds (IOUs from governments) and gold. Roughly, the same mood moves many assets together.
Why it matters for your money: Global confidence rises (risk-on) → investors chase returns → tend to buy shares and the AUD, and lean away from safe-havens → super balances (mostly invested in shares) and the dollar often rise; flip to fear (risk-off) → it tends to reverse, with money moving into government bonds and gold
The VIX is a number that gauges how much investors expect US share prices to swing over the next month. It is calculated from the prices of "options" (contracts that act like insurance, paying out if markets move sharply). When traders feel calm, they pay little for that protection, so the VIX sits low. When they get scared, they rush to buy protection, option prices jump, and the VIX spikes; that is its "fear gauge" nickname. Think of home-insurance premiums in storm season: prices climb when people sense danger. Such fear often pushes money away from riskier assets like the Australian dollar and mining shares.
Why it matters for your money: VIX spikes (signalling rising US fear) → investors often move money out of riskier assets → AUD tends to be sold off and mining-share prices tend to fall → your Australian dollar may buy less overseas and your miner shares may drop in value
Related tool: Compound interest calculator →
A share is a tiny slice of a company, and its worth reflects the cash that slice is expected to generate in future years. But future money is worth less than money today, so we shrink those future amounts down to today's value: this is "discounting". Interest rates set how hard we shrink. The P/E (price-to-earnings) multiple is simply the price you pay per dollar of yearly profit, so a $30 share earning $1 a year has a P/E of 30. When the RBA (Reserve Bank of Australia) lifts interest rates, future earnings get shrunk harder, so prices tend to fall. Tech firms, whose profits sit further in the future, typically feel this most.
Why it matters for your money: RBA (Reserve Bank of Australia) lifts interest rates → future earnings discounted harder → P/E multiples compress → share prices tend to fall (tech firms typically hardest) → your super and brokerage balance shrink
Every currency has an interest rate — basically the cost of borrowing it. Japan's has sat near zero for decades; Australia's is higher. So traders borrow cheap yen, swap it into Aussie dollars, and park it where it earns more. That gap is their profit — like using a 0% credit card to leave money in a 4% savings account. Easy money, until the gap shrinks or the exchange rate turns. Because the trade only works when investors feel calm, AUD/JPY (how many yen one Aussie dollar buys) rises in good times and falls in fear, acting as a global mood gauge.
Why it matters for your money: Calm markets → traders borrow cheap yen and buy higher-yielding Aussie dollars → that demand lifts AUD/JPY (the rate climbs as one Aussie dollar buys more yen) and Aussie assets → then sudden fear hits → everyone rushes to repay their yen loans at once (the "unwind"), buying yen back → AUD is sold hard, so AUD/JPY falls → the Aussie dollar drops and your shares and super (retirement savings) dip.
Related tool: Mortgage repayment calculator →
Money is just a promise people agree to trust. Because oil, gold and most global trade are priced in US dollars, almost every country needs a stash of USD to do business, making it the world's main reserve currency (the default money nations hold). The DXY, or US Dollar Index, is a scoreboard tracking the dollar's value against a basket of other major currencies like the euro and yen. Here's the everyday analogy: a giant global vending machine takes only US dollars, so when dollars get pricier, buyers using other currencies must pay more for the same iron ore or oil, and that softer demand tends to nudge prices down.
Why it matters for your money: USD strengthens (DXY up) → globally-priced commodities like iron ore get pricier for buyers using non-US currencies, so their demand softens and USD prices tend to ease → miners' export earnings and demand for the Australian dollar (AUD) soften → a lower AUD and weaker resource shares can show up in your super (your retirement savings) and portfolio
Oil is priced like anything else: by supply versus demand. When the world wants more oil than is being pumped, the price climbs; when there's a glut, it falls. Supply is partly steered by OPEC, a club of big oil-producing nations that can agree to pump less and lift prices—like a handful of farmers at a market quietly deciding to bring fewer apples so each one sells dearer. Geopolitics (wars, sanctions) can choke supply too. Two benchmark prices exist: Brent (the global/European marker) and WTI (the US marker), differing mainly by location and oil grade (WTI is lighter).
Why it matters for your money: OPEC cuts output / conflict disrupts supply → oil price rises → costlier petrol, freight & manufacturing → broad inflation → the Reserve Bank of Australia (RBA) may lift interest rates, while AU energy stocks (e.g. Woodside) often benefit → your fuel bill, mortgage repayments & shares
Gold is a metal that can't be printed, doesn't rust, and can't be wiped out by a company going bust. That scarcity is its appeal. When people fear a crisis or worry that inflation (rising prices) is eating their cash, they shift money into gold—a "safe haven" that tends to hold its worth. But gold pays no interest, so it competes with bonds (loans to governments that pay a yield). When real yields (interest after inflation) rise, bonds look tempting and gold loses shine. So a rising gold price often signals fear or falling real yields.
Think of gold as an umbrella: useless on sunny days, prized when storms hit.
Why it matters for your money: Crisis fears or higher expected inflation → investors seek safety + real bond yields fall → demand for gold rises → gold price climbs → gains for gold ETFs and Aussie gold-miner shares in your portfolio
Related tool: Compound interest calculator →
Imagine a country town with one big factory. When the city economy booms, the factory roars; when the city catches a cold, the factory shuts first and loudest. Bitcoin has increasingly behaved like that factory. As big institutions hold it alongside shares, it rises and falls with the same "risk-on, risk-off" mood — investors piling into or fleeing risky assets — that moves stocks, only more violently (high-beta: it swings bigger than the market). Because crypto trades 24/7, even weekends, it can react to news before share markets open — a "canary." Spot-Bitcoin ETFs (sharemarket-listed funds holding actual Bitcoin) channel everyday money in and out, which can amplify moves.
Why it matters for your money: Global risk mood (interest rates, recession fears) → institutional and ETF money flowing into or out of Bitcoin → Bitcoin's 24/7 price acting as an early "canary" → that sentiment spilling into share markets → effects on your super, ETFs and the Australian dollar
Most people buy a house with borrowed money, repaid monthly. A bank decides how much to lend by checking whether you can afford the repayments, weighing your income, expenses and debts — your "serviceability." When interest rates (the price of borrowing) fall, the same repayment covers a bigger loan, so buyers can bid more and prices tend to climb. When rates rise, borrowing capacity shrinks and prices tend to cool. Picture a seesaw: rates on one side, prices on the other. Prices react slowly, though. Fixed-rate loans, slow-to-sell homes and habit mean changes to the Reserve Bank's cash rate often take a year or more to fully show in prices.
Why it matters for your money: RBA cash rate → mortgage interest rate → your monthly repayment & borrowing capacity → what buyers can bid → house prices → your home equity & deposit size
Related tool: Mortgage repayment calculator →
Banks don't lend you their own money—they borrow it first, then lend it on. The main benchmark for what they pay is the RBA's cash rate (the base rate the RBA sets), but on top sits a "funding spread": the extra they pay savers for deposits and investors who lend to banks in financial markets. Your mortgage rate is built on all that. So when nervous markets make borrowing dearer for banks, that cost can flow through to you—rates can rise even with the RBA on hold. Like a café: when the wholesale coffee-bean price jumps, your flat white gets dearer even though the café's rent hasn't moved.
Why it matters for your money: RBA cash rate + market nerves → banks' cost to raise money (deposits from savers, plus "wholesale funding" — money banks borrow in bulk from financial markets), which together set the funding spread → the rate banks charge you → your mortgage repayment
Related tool: Mortgage repayment calculator →
A share is a tiny slice of a company. A dividend is the company handing some of its profit back to shareholders, usually a couple of times a year — say 50 cents per share. To receive the next payment you must own the share before a cutoff called the ex-dividend date; buy on or after that date and the seller keeps the payment. On that date the price typically falls by roughly the dividend, since new buyers no longer get it. Australia adds franking credits: if the company already paid company tax (usually 30%) on that profit, it attaches a credit so the profit isn't taxed twice over.
Why it matters for your money: Company earns profit → pays company tax → distributes the rest as a dividend with an attached franking credit → on the ex-dividend date the share price typically falls by roughly the dividend → the cash is paid into your account, and the franking credit is a tax credit you claim at tax time (not a cash deposit)
Related tool: Income tax & take-home pay calculator →
Picture a tap that drips into a giant bucket every payday. By law, your employer must pay an extra slice of your wage—currently 12%—into your "superannuation," a savings pot you generally can't touch until retirement. Because the money sits there, the fund managing it puts it to work, mostly buying shares (small ownership stakes in companies). Multiply that drip across roughly 14.7 million working Australians, year after year, and the bucket now holds about A$4 trillion. Money keeps flowing in every payday. So even if you never buy a single share yourself, your retirement savings already own a piece of the market.
Why it matters for your money: Your payday → your employer's 12% super contribution → the fund invests the cash → the fund buys assets, mostly shares (including companies listed on the ASX, Australia's main stock exchange) → your retirement balance rises and falls with markets you never personally traded
Related tool: Income tax & take-home pay calculator →
Imagine a country's economy as a busy restaurant. Jobs data — like US "payrolls" (how many people got hired) or Australia's monthly Labour Force survey — tells you how full the place is. When almost everyone has a job, employers compete for staff, so wages tend to rise. People with fatter pay packets spend more, which can push prices up — part of inflation (the general rise in prices over time). To cool an overheating economy, central banks like Australia's Reserve Bank (the RBA) lift interest rates (the cost of borrowing). Higher rates ripple into mortgages, business costs and share prices — so markets react fast to each jobs number.
Why it matters for your money: Strong jobs report → wages tend to rise → more spending → upward pressure on inflation → RBA (Reserve Bank of Australia) or the US Fed (Federal Reserve, the US central bank) may lift interest rates → dearer mortgages and pricier borrowing for companies → effects on your home-loan repayments, shares and savings rate
GDP (Gross Domestic Product) is the total value of the finished goods and services a country produces — every coffee, haircut, and tonne of iron ore. Picture the economy as a bathtub: spending pours in, and the water level is GDP. When confidence is high, the tap runs fast (a boom); when people pull back, it drains. As a rule of thumb, two quarters (six months) of falling GDP is called a recession. Surveys called PMIs (Purchasing Managers' Indexes) ask businesses if orders are rising, giving an early peek before official figures. Counterintuitively, strong growth can spook markets: it may push the RBA (Reserve Bank of Australia) to raise rates.
Why it matters for your money: Strong GDP/PMI data → higher inflation fears → RBA raises interest rates → bonds and shares repriced lower, mortgage repayments rise → your portfolio and home-loan cost