Inflation
Also written Inflation (income-product factor)
A sustained general rise in the price level, which erodes what a rupee buys — and the reason a nominal return has to be deflated before it means anything.
In plain language
Inflation is not one item getting dearer. It is the general level of prices rising, and going on rising.
The consequence is the one that matters for investing: money loses purchasing power over time. At 6% inflation, what Rs 100 buys today will cost Rs 106 next year. A return has to beat that before the investor is any better off.
How it works
It is measured through index numbers. India's policy anchor is the Consumer Price Index, which covers retail prices including services; the Wholesale Price Index tracks goods at the wholesale stage and contains no services at all. Under flexible inflation targeting the RBI is mandated to hold CPI inflation at 4%, within a band of 2 percentage points either side, and raises the repo rate to cool demand when it drifts above.
For a research analyst inflation enters the model from four directions at once: it lifts the risk-free rate, therefore the discount rate, therefore lowers present values; it raises input costs; and it determines whether the company can pass those costs on. That last one — pricing power — is what separates companies that survive an inflationary year from those that do not.
The formula
Inflation rate = (Index now − Index a year ago) ÷ Index a year ago × 100
Real return ≈ Nominal return − Inflation (approximation)
Real return = [(1 + nominal) ÷ (1 + inflation)] − 1 (exact)
A worked example
An investor in the 30% tax bracket puts Rs 10 lakh into a fixed deposit paying 7.2%, with inflation running at 6.1%.
Post-tax nominal return = 7.2% × 0.70 = 5.04%
Real return = (1.0504 ÷ 1.061) − 1 = −1.0%
After a year the account shows Rs 10.50 lakh, and it buys about Rs 9.90 lakh of what the original sum would have bought. The deposit paid interest every quarter and still lost money.
The same force works through the companies being analysed. A paints maker facing input costs up 12% while realisations rise 4% watches its gross margin compress by several percentage points — unless its brand lets it raise prices, which is precisely what the industry analysis was for.
Why NISM asks about it
Chapter 5 (Economic Analysis) covers inflation, its two classic causes and the policy response. Expect the demand-pull versus cost-push distinction, CPI versus WPI, a real-return computation, and the chain from inflation to interest rates to valuations.
Common exam traps
- Falling inflation is disinflation, not deflation. Deflation means prices are actually falling — a different and more dangerous condition.
- The subtraction shortcut is an approximation. At high rates use the exact formula; the gap grows with the numbers.
- WPI contains no services and CPI does, and it is CPI that the RBI targets.
- Inflation transfers wealth from lenders to borrowers where the debt is at a fixed rate — the repayment is made in cheaper rupees.
- It hits valuations twice: once by raising the discount rate, and again by squeezing the margins being discounted.
Where this is taught
- Series V-A · Chapter 1: Investment Landscapeintroduced here
- Series XV · Chapter 5: Economic Analysisintroduced here
- Series X-B · Chapter 4: Retirement Planning Basicsintroduced here
- Series SEBI-ICE · Chapter 2: Key Concepts in personal financeintroduced here
- Series X-B · Chapter 6: Miscellaneous aspects of Retirement Planning
Related terms
- Bank RateThe rate at which the central bank lends to commercial banks without collateral, for medium to long-term or emergency needs — one of RBI's tools for controlling money supply and rates.
- Cost-push inflationA rise in the general price level caused by higher input costs to producers — wages, raw materials, energy — rather than by demand outrunning supply.
- Demand-pull inflationInflation caused by demand running ahead of the supply available to meet it — too much money chasing too few goods.
- Gross Domestic ProductThe market value of all final goods and services produced inside a country's borders in a period, whoever owns the producer — the standard measure of the size and growth of an economy.
- Real interest rateThe nominal rate adjusted for inflation — what the lender actually gains in purchasing power, and a number that turns negative whenever inflation runs above the coupon.
- Fisher effectThe proposition that, other things equal, a rise in expected inflation raises the nominal interest rate — which is why interest rate derivatives are the household sector's instrument for hedging inflation.
- Leading economic indicatorA measure of economic recovery that improves before the actual economy does, because it reflects expectations for the future rather than current or past activity — and the workbook names the stock market itself as one.
- Financial goalA financial objective — a child's education, a house, retirement — to which an amount and a timeline have been assigned, so that it can actually be planned for and funded.
- Risk premiumThe extra return an investor demands over the nominal risk-free rate as compensation for uncertainty about future cash flows — the last and largest block in the required rate of return.
- InvestmentThe current commitment of savings for a defined period, in the expectation of receiving back more than was committed — savings put to work, as distinct from savings merely held.
- Gold Sector FundA scheme holding the shares of gold mining and gold processing companies, so its returns follow those companies' profits rather than the price of gold, unlike a Gold ETF.
- Gross National ProductThe market value of goods and services produced by a country's residents wherever in the world they are — GDP measured by nationality rather than by geography.
- Monetary policyThe central bank's management of money supply and interest rates to promote growth and hold prices stable — expansionary when it wants to push the economy up, contractionary when it wants to cool it.
- Repo rateThe rate at which the central bank lends money to banks for a very short term against approved securities — the main lever it pulls to make money cheaper or dearer.
- Fiscal deficitThe budgeted excess of the government's expenditure over its revenues in a year, usually stated as a percentage of GDP and bridged by borrowing.
- CPIAn index tracking the retail-level prices of a defined basket of goods and services over time — the standard measure of the inflation actually felt by consumers.
- Unemployment rateThe share of a country's eligible, willing-to-work population that is unemployed, in percentage terms — a macroeconomic variable that rises in a slowdown and falls in an expansion.
- WPIWholesale Price Index — one of the two ways the workbook says inflation is measured, tracking a basket of goods at wholesale prices, as against CPI at the retail level.
- MacroeconomicsThe study of the economy as a whole — the aggregate supply and demand factors such as GDP, unemployment, inflation, savings and investment, and the public policies that move them.
- Fiscal policyThe government's measures on its own revenues and expenses — taxation and spending — used to influence aggregate demand, savings, investment and overall economic activity.
- The Pool ApproachMeeting all financial needs from one undivided pool of savings, rather than earmarking investments to specific goals — simpler to run, but leaves the investor unsure of the true investment horizon.
- Cost Inflation IndexAn index notified by the CBDT each year, with 2001-02 as the base of 100, used to restate the cost of a long-term capital asset in current rupees so that inflation is not taxed as capital gain.
- Capital appreciationThe gain made when the market value of an investment rises above what you paid for it — as distinct from income, which is the interest or dividend the investment pays you along the way.
- Compound interestInterest earned on the original amount and also on the interest already earned. Rs 1,000 at 9% grows to Rs 31,409 in 40 years compounded, against Rs 4,600 with simple interest.
- PV functionThe spreadsheet function that converts a stream of future payments into the single lump sum needed today — the tool the workbook uses to size a retirement corpus and a life insurance cover.
- Accumulation stageThe working years, in which saving and investment build the retirement corpus — the stage where the ability to take risk is highest and where time, not contribution size, does most of the work.
- Distribution stageThe retired years, in which the corpus built during working life is converted into periodic income — the stage where protecting capital matters more than growing it, because it can no longer be topped up.
- Simple interestInterest earned only on the amount you first put in (the principal). The interest is not added back, so it never earns interest of its own, unlike compound interest.
- Nominal returnThe stated rate of return quoted on an investment before adjusting for inflation — as opposed to the workbook's real rate of return, which accounts for it.
- Time value of moneyThe principle that the same sum of money is worth different amounts at different points on a timeline, because money held today can be invested and because inflation erodes what it will buy.
- Real rate of returnThe return on an investment after the effect of inflation has been removed — what the money actually buys more of, as against the nominal percentage the product advertises.
- Inflation riskThe risk that the money an investment pays out will be worth less in goods and services than expected, because prices have risen — highest in fixed-return products and most damaging to retirees.
- Terminal Growth RateThe constant rate at which free cash flow is assumed to grow forever after the explicit forecast period — the "g" in terminal value = FCF(T+1) / (WACC − g). In young companies it can drive most of the value.
- Safe haven assetAn asset investors turn to when an economy or a currency fails. In the workbook the safe haven asset is gold — considered by many the final shelter, though the opposite camp argues strongly against it.
- Purchasing powerWhat a sum of money can actually buy in goods and services. Inflation reduces it, so the same rupee amount buys less the further in the future it is received.
- Present valueWhat a sum of money due in the future is worth today, found by discounting it back at the rate the money could earn: PV = FV ÷ (1 + r)^n.
- Expense Protection MethodA way of estimating retirement income need by listing expected pre- and post-retirement expenses head by head and inflating the total to the retirement date — more precise than a replacement ratio, but cumbersome.
- Business cycleThe recurring pattern of expansion and recession in an economy's GDP, which drives how equity, bond and real estate returns behave at different points in time.
- Contractionary policyGovernment or central bank actions — such as raising interest rates or taxes — used to cool an overheating economy and contain inflation, at a cost to bond and equity valuations.
- Current account deficitThe gap that arises when a country imports more goods and services than it exports, making it a net borrower of foreign currency from the rest of the world.
- Expansionary policyGovernment or central bank actions — such as keeping interest rates low or increasing spending — used to encourage economic activity, which tends to lift equity, bond and real estate values.
- Negative real returnA return that looks positive on the statement but sits below the inflation rate, so the money buys less than it did before — the case the workbook flags when it says a real rate can be negative.
- Real Risk-free RateThe basic return an investor demands purely for postponing consumption, assuming no inflation and no uncertainty about future cash flows — the pure time value of money.
- Nominal Risk-free RateThe return on an investment whose amount and timing are certain, before adjusting for inflation: the real risk-free rate plus compensation for expected inflation.
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