Financial Glossary

Beta

Beta measures how much a stock's price tends to move relative to the overall market. A beta of 1 means the stock moves with the market; above 1 means it is more volatile; below 1 means it is less volatile. Beta is the risk input in the CAPM formula used to estimate cost of equity.

CAPM (Capital Asset Pricing Model)

The Capital Asset Pricing Model (CAPM) estimates the expected return of an investment based on its sensitivity to market risk. The formula is: expected return = risk-free rate + beta × (market return − risk-free rate). In valuation it is the standard way to estimate a company's cost of equity.

Cost of Debt

Cost of debt is the effective interest rate a company pays on its borrowings. Because interest is tax-deductible, the figure that feeds into WACC is the after-tax cost of debt: the pre-tax rate multiplied by one minus the tax rate. It is typically the cheapest source of financing a company has.

Cost of Equity

Cost of equity is the rate of return shareholders require in exchange for the risk of owning a company's stock. It is usually estimated with the Capital Asset Pricing Model (CAPM): the risk-free rate plus the stock's beta multiplied by the equity risk premium. It is one of the two building blocks of WACC.

Discount Rate

A discount rate is the rate used to convert a future sum of money into its value today, reflecting the time value of money and risk. The higher the rate, the less a future cash flow is worth now. In company valuation the discount rate is usually the WACC; for equity-only cash flows it is the cost of equity.

Equity Risk Premium

The equity risk premium is the additional return investors expect to earn from holding stocks instead of risk-free government bonds. It compensates them for the extra risk of equities. In the CAPM, it is the market return minus the risk-free rate, then scaled by a stock's beta.

Risk-Free Rate

The risk-free rate is the theoretical return on an investment with no risk of loss, used as the baseline for pricing all other assets. In practice it is taken from the yield on a high-quality government bond, such as the 10-year US Treasury. It is the starting point of the CAPM formula.

WACC (Weighted Average Cost of Capital)

WACC, or weighted average cost of capital, is the blended rate of return a company must earn to satisfy all its investors. It averages the cost of equity and the after-tax cost of debt, weighting each by its share of the company's total financing. WACC is the discount rate most analysts use to value a business in a discounted cash flow model.

Book Value per Share

Book value per share is a company's common shareholders' equity divided by the number of shares outstanding. It shows the accounting, or net asset, value attributable to each share if the company's assets were sold at their balance-sheet value and all liabilities repaid. Investors compare it with the market price to gauge whether a stock trades above or below its accounting worth.

Capital Expenditure (CapEx)

Capital expenditure, or CapEx, is the money a company spends to acquire, upgrade or maintain long-term physical assets such as property, plant and equipment. Unlike operating expenses, CapEx is not fully deducted in the year it is incurred; instead it is capitalised on the balance sheet and expensed gradually through depreciation over the asset's useful life. CapEx appears in the investing section of the cash flow statement.

Discounted Cash Flow (DCF)

Discounted cash flow (DCF) is a valuation method that estimates what a company is worth today based on the cash it is expected to generate in the future. Each future cash flow is discounted back to present value using a discount rate, usually the WACC, and the results are summed, along with a terminal value.

Earnings per Share (EPS)

Earnings per share, or EPS, is a company's net income minus preferred dividends, divided by the weighted average number of common shares outstanding. It measures the profit attributable to each share and is one of the most widely watched indicators of corporate profitability. EPS is the denominator's partner in the price-to-earnings ratio and a primary driver of share valuation.

Enterprise Value

Enterprise value, or EV, is the total value of a company to all its capital providers. It equals market capitalisation plus total debt, minus cash and cash equivalents. EV represents the theoretical price to acquire the whole business: a buyer assumes its debt but gains its cash, so cash is subtracted. It is widely used to compare companies regardless of how they are financed.

EV/EBITDA

EV/EBITDA is a valuation multiple equal to a company's enterprise value divided by its earnings before interest, taxes, depreciation and amortisation. It shows how many times a company's core operating cash earnings the market is paying for the whole business. Because it uses enterprise value and pre-financing profit, it allows comparison across firms with different debt levels and tax situations.

Free Cash Flow

Free cash flow (FCF) is the cash a company has left after paying for its operating costs and capital expenditures. It is the money genuinely available to repay debt, pay dividends, buy back shares, or reinvest. It is calculated as operating cash flow minus capital expenditures.

Graham Number

The Graham Number is a quick formula for estimating a conservative fair value for a defensive stock, devised by Benjamin Graham. It is the square root of 22.5 multiplied by earnings per share and book value per share. If a stock trades below its Graham Number, it may be undervalued by this measure.

Internal Rate of Return (IRR)

The internal rate of return, or IRR, is the discount rate at which the net present value of an investment's cash flows equals zero. It represents the annualised effective return the investment is expected to generate over its life. A project is generally worth pursuing when its IRR exceeds the required rate of return, or hurdle rate.

Intrinsic Value

Intrinsic value is an estimate of what a company is genuinely worth based on its fundamentals — its future cash flows, assets and earnings power — independent of its current market price. Value investors buy when market price falls well below intrinsic value. It is most commonly estimated with a discounted cash flow model.

Margin of Safety

Margin of safety is the gap between a stock's estimated intrinsic value and the price you pay for it, expressed as a percentage. It is the cushion that protects an investor if their valuation proves too optimistic. The concept, central to value investing, was popularised by Benjamin Graham.

Net Present Value (NPV)

Net present value, or NPV, is the value today of an investment's expected future cash flows, discounted at a required rate of return, minus the initial outlay. It converts money received at different times into a single comparable figure in today's terms. A positive NPV means the investment is expected to add value; a negative NPV means it destroys value.

Operating Cash Flow

Operating cash flow (OCF) is the cash a company generates from its core, day-to-day business operations during a period. It strips out financing and investing activities to show whether the actual business produces enough cash to fund itself. Under the indirect method, OCF starts from net income, adds back non-cash charges such as depreciation, and adjusts for changes in working capital. It is the first section of the cash flow statement.

P/E Ratio

The price-to-earnings ratio, or P/E ratio, is a stock's current share price divided by its earnings per share. It shows how many dollars investors are willing to pay for each dollar of a company's annual profit. A high P/E suggests the market expects strong future growth, while a low P/E may indicate a cheaper valuation or weaker prospects.

Perpetuity

A perpetuity is a series of identical cash flows that is paid at regular intervals forever, with no end date. Although the payments never stop, its value today is finite because each future payment is worth less when discounted. The present value of a perpetuity equals the periodic cash flow divided by the discount rate: PV = C ÷ r. It is a building block of bond and equity valuation.

Terminal Value

Terminal value represents all of a company's expected cash flows beyond the explicit forecast period of a DCF model, condensed into a single figure. It is most often calculated with the Gordon growth method: the final-year cash flow grown by a modest perpetual rate, divided by the discount rate minus that growth rate.

Dividend Discount Model

The dividend discount model (DDM) is a valuation method that estimates a stock's fair value as the present value of all the dividends it is expected to pay in the future, discounted at the investor's required rate of return. Its most common form, the Gordon growth model, assumes dividends grow at a constant rate forever, giving a simple closed-form formula for valuing dividend-paying shares.

Dividend Reinvestment (DRIP)

Dividend reinvestment, often run through a DRIP (dividend reinvestment plan), automatically uses the cash dividends a stock pays to buy additional shares of the same stock instead of paying the cash to the investor. Over time this compounds returns: each reinvested dividend buys more shares, which then earn dividends of their own. Many plans buy fractional shares and charge little or no commission.

Dividend Yield

Dividend yield is the annual dividend a stock pays per share divided by its current share price, expressed as a percentage. It tells an investor how much cash income a share returns relative to its market price, independent of any capital gain. Yield rises when the price falls and falls when the price rises, so it is a quick gauge of a stock's income return at today's price.

Payout Ratio

The payout ratio is the proportion of a company's earnings that it distributes to shareholders as dividends, calculated by dividing dividends per share by earnings per share (or total dividends by net income). It shows how much profit is returned to investors versus retained to fund growth. A ratio above 100% means the company is paying out more than it earns, which is usually unsustainable.

Yield to Maturity

Yield to maturity (YTM) is the total annual return an investor earns on a bond if it is bought at today's price and held until it matures, assuming every coupon is reinvested at that same rate. It is the single discount rate that makes the present value of all the bond's future coupon and principal payments equal its current market price, so it captures coupon income plus any gain or loss to par.

Asset Allocation

Asset allocation is the way an investment portfolio is divided across the major asset classes — typically stocks, bonds, cash, property and alternatives. It is the primary driver of a portfolio's long-term risk and return, more so than the choice of individual securities within each class.

Base Currency

A base currency is the reference currency in which the value of a portfolio, account, or financial result is expressed. In a foreign-exchange quote it is the first currency of the pair — the one being priced — while the second is the quote currency. The base currency lets you compare holdings denominated in many currencies on a single, consistent measuring stick.

Currency Exposure

Currency exposure is the degree to which your wealth is affected by movements in foreign exchange rates. It arises whenever your assets, income or liabilities are denominated in a currency other than the one you spend in. The larger the mismatch, the more your net worth swings with exchange rates.

Exchange Rate

An exchange rate is the price of one currency expressed in terms of another — for example, how many US dollars one euro buys. It is the figure used to convert money from one currency to another for trade, travel and investing. Rates quoted as EUR/USD show how much of the second currency (USD) equals one unit of the first (EUR), and they move constantly with supply and demand.

Net Worth

Net worth is the total value of everything you own minus everything you owe. Assets include cash, investments, property and business interests; liabilities include mortgages, loans and credit-card balances. It is the single clearest snapshot of your financial position at a point in time.

Portfolio Rebalancing

Portfolio rebalancing is the practice of buying and selling assets to return a portfolio to its target asset allocation after market movements have shifted the weights. When one asset class outperforms, it grows to a larger share than intended; rebalancing trims it and tops up the lagging classes. This enforces a disciplined "sell high, buy low" rule and keeps risk at the chosen level.

Return on Investment (ROI)

Return on investment, or ROI, is a simple profitability measure that expresses the gain or loss on an investment as a percentage of its cost. It is calculated as net profit divided by the cost of the investment: ROI = (final value − initial cost) ÷ initial cost. Because it is easy to compute and compare, ROI is one of the most widely used metrics for judging how efficiently money has been used.

Coast FIRE

Coast FIRE is a variant of FIRE (Financial Independence, Retire Early) in which you have already invested enough that, with normal market growth and no further contributions, your portfolio will reach your retirement target by your chosen retirement age. You still work to cover current living costs, but you no longer need to save for retirement — your existing investments "coast" to the finish line.

Compound Interest

Compound interest is the interest you earn not only on your original principal but also on the interest already added to it. Over time this creates accelerating, exponential growth. The future value formula is principal × (1 + rate) raised to the number of periods.

Dollar-Cost Averaging

Dollar-cost averaging (DCA) is the practice of investing a fixed amount of money at regular intervals, regardless of the asset's price. Because the fixed sum buys more shares when prices are low and fewer when prices are high, it lowers the average cost per share over time and removes the need to time the market. It is the discipline behind most automatic savings and pension plans.

Fat FIRE

Fat FIRE is a variant of FIRE (Financial Independence, Retire Early) achieved on a generous, comfortable annual budget rather than a frugal one. Because target spending is high, it requires a much larger portfolio, so it usually takes longer or a higher income to reach. Fat FIRE lets you retire early without significantly cutting back on lifestyle — travel, housing and discretionary spending stay at or above average.

FIRE (Financial Independence, Retire Early)

FIRE stands for Financial Independence, Retire Early — a strategy of saving and investing a large share of income to build enough wealth to live on investment returns rather than a salary. The target, often called the FIRE number, is commonly estimated as annual expenses multiplied by 25, based on a 4% safe withdrawal rate.

Future Value

Future value (FV) is the amount that a sum invested today will grow to by a later date, given an assumed rate of return. It captures the effect of compounding: each period's earnings are added to the principal and themselves earn returns. Future value answers the question, "If I invest this money now, how much will it be worth then?"

Lean FIRE

Lean FIRE is a variant of FIRE (Financial Independence, Retire Early) achieved on a minimal, frugal annual budget. Because target spending is low, the portfolio needed to sustain it is smaller, so financial independence arrives sooner. Lean FIRE typically means living well below average spending — minimising housing, travel and discretionary costs — and relies on keeping expenses tightly controlled in retirement.

Present Value

Present value (PV) is the amount that a future cash flow is worth today, found by discounting it at a chosen rate. Because money can earn a return over time, a dollar received in the future is worth less than a dollar held now. PV reverses compounding: it tells you how much you would need to invest today to reach a given future amount.

Safe Withdrawal Rate

The safe withdrawal rate is the percentage of a retirement portfolio you can withdraw each year, adjusted for inflation, without a high risk of running out of money over your lifetime. The best-known benchmark is the 4% rule, derived from historical US market data in the Trinity study.

SIP (Systematic Investment Plan)

A systematic investment plan (SIP) is an automated arrangement to invest a fixed amount into a mutual fund or ETF at regular intervals, typically monthly. It is the structured, automatic application of dollar-cost averaging: contributions are deducted and invested on schedule, buying more units when prices fall and fewer when they rise. SIPs are especially popular for long-term, hands-off fund investing.

Market Sentiment

Market sentiment is the overall attitude or mood of investors toward a particular market or asset at a given time. It is described as bullish when investors are optimistic and prices are expected to rise, and bearish when they are pessimistic and prices are expected to fall. Sentiment reflects collective emotion and expectation rather than fundamentals, and can drive prices away from intrinsic value in the short term.

Sector Rotation

Sector rotation is an investing strategy that moves money from one market sector to another to match the changing phase of the economic cycle. Because sectors such as technology, energy, utilities and consumer staples tend to outperform at different points in the cycle, rotators overweight the sectors expected to lead and underweight those expected to lag, aiming to beat a broad market index.

Sharpe Ratio

The Sharpe ratio measures how much return an investment earns above the risk-free rate for each unit of risk it takes. It is calculated by subtracting the risk-free rate from the portfolio's return and dividing by the portfolio's standard deviation. A higher Sharpe ratio means better risk-adjusted performance; it lets investors compare portfolios with different levels of volatility on a fair basis.

Standard Deviation

Standard deviation measures how much a set of values is spread out from its average. It is the square root of the variance — the average of the squared differences between each value and the mean. In finance it quantifies how widely returns vary around their average, so it is the standard way to express the volatility, and therefore the risk, of an investment. A larger standard deviation means more dispersion.

Volatility

Volatility measures how much an asset's price or return swings around its average over a given period. It is most often expressed as the standard deviation of returns, annualised so that assets can be compared on the same time scale. High volatility means large, frequent price moves and greater uncertainty; low volatility means steadier prices. Volatility is the most common quantitative proxy for investment risk.

Black-Scholes Model

The Black-Scholes model is a mathematical formula that estimates the fair price of a European-style option. It uses five inputs: the current price of the underlying asset, the option's strike price, the time to expiration, the risk-free interest rate, and the volatility of the underlying. By combining these, the model produces a theoretical option value, and it remains the foundational framework for modern option pricing.

Implied Volatility

Implied volatility is the market's expectation of how much an asset's price will move over the life of an option, expressed as an annualized percentage. It is not observed directly but backed out of an option's market price using a pricing model such as Black-Scholes: the volatility input that makes the model's value equal the traded price is the implied volatility. Higher implied volatility means more expensive options.

Option Greeks

Option Greeks are a set of risk measures that show how an option's price is expected to change when one input moves. Delta measures sensitivity to the underlying's price, gamma the rate of change of delta, theta the loss of value as time passes, vega the sensitivity to volatility, and rho the sensitivity to interest rates. Traders use them to understand and hedge an option position's risks.

Debt Snowball

The debt snowball is a debt-payoff strategy in which you order your debts from smallest balance to largest, make minimum payments on all of them, and throw every spare dollar at the smallest one. When it is cleared, you roll its payment into the next-smallest debt. The method prioritises quick wins and motivation over minimising total interest.

183-Day Rule

The 183-day rule is a widely used test for determining tax residency: if you are physically present in a country for 183 days or more during a defined period — usually a calendar or tax year — that country may treat you as a tax resident. The exact period, how partial days are counted, and any extra conditions vary by jurisdiction and applicable tax treaties.

Digital Nomad

A digital nomad is a person who earns a living through remote work — typically online — while travelling and living in different locations rather than from a single fixed base. Because their physical location and their employer or clients can be in different countries, digital nomads face particular questions around tax residency, visas and social security, since each country they spend time in may have its own day-count and residency tests.

Tax Residency

Tax residency is the status that determines which country has the primary right to tax a person's income, and often their worldwide income rather than only locally sourced income. Countries set their own tests, but they commonly look at how many days you spend there, whether you maintain a permanent home, and where your centre of vital interests — family, work and economic ties — lies.