Part 1 — Your Very First Questions
Chapter 4 of 40
Key Terms You Will See Everywhere
Portfolio, asset, yield, liquidity, bull, bear — decoded in plain English
"Financial jargon exists partly because finance is genuinely complex, and partly because complexity is good for fees. This chapter cuts through both. Twenty terms. Plain English. No MBA required."
For educational purposes only. Nothing in this chapter is financial advice. All figures are illustrative examples. Tax rules, account types, contribution limits, and regulations differ by country and change over time. Always verify current rules with official government sources or a qualified financial adviser before making any investment decisions.
Why Terms Matter
Financial jargon serves a legitimate purpose — it allows professionals to communicate precisely and concisely. The problem is that it also creates a barrier that makes investing feel inaccessible to anyone who has not studied finance.
The vocabulary of everyday investing is not large. Twenty terms cover the vast majority of what you will encounter on investment platforms, in fund documentation, and in financial news. This chapter defines them in plain English, with no assumed background.
Core Concepts
Asset
Anything with financial value that you can own. Shares, bonds, property, and cash are all assets. When professionals talk about asset allocation, they mean how your money is split across different types of assets.
Portfolio
Your entire collection of investments taken together. If you own shares in a global ETF, some government bonds, and cash in an ISA, that combination is your portfolio.
Equity
Ownership in a company. When you buy shares or stocks, you are buying equity. The terms are used interchangeably. Equity holders benefit when the company grows but take the loss if it fails.
Bond
A loan you make to a government or company. They agree to pay you interest at regular intervals and return your original capital at an agreed end date (called maturity). Bonds are generally lower risk than equities but offer lower expected returns.
Index
A list of companies grouped by a specific rule. The S&P 500 contains the 500 largest US companies by market value. The FTSE 100 contains the 100 largest UK companies. Indices are used as benchmarks and as the basis for index funds.
Fund
A pooled investment vehicle that holds multiple assets on behalf of investors. Mutual funds, index funds, and ETFs are all types of fund. Instead of managing individual stocks yourself, a fund does it automatically — at varying cost.
ETF
Exchange-Traded Fund. A type of fund that trades on a stock exchange throughout the day, just like a single share. ETFs typically track an index passively and charge very low annual fees — usually 0.07–0.22%.
Diversification
Spreading investments across many different assets, sectors, and geographies to reduce concentration risk. If you own 500 companies across 40 countries, poor performance from any single one barely affects your portfolio overall.
Market Terms
Bull market
A period when markets are rising — generally defined as a 20%+ increase from a recent low. Bull markets tend to last longer than bear markets. The 2009–2020 US bull market was the longest in modern history, lasting roughly 11 years.
Bear market
A period when markets are falling — generally defined as a 20%+ decline from a recent high. Bear markets are normal and have occurred regularly throughout stock market history. Every bear market in modern history has eventually been followed by a new high.
Market capitalisation
The total value of all a company shares. Calculated as share price multiplied by number of shares in issue. Market cap determines which index a company belongs to. Large cap typically means above $10 billion; small cap typically means below $2 billion.
Volatility
How much an investment price moves up and down over time. High volatility means larger swings; low volatility means steadier movement. Volatility is often measured as standard deviation. Higher standard deviation means more unpredictable short-term movements.
Benchmark
A standard used to measure investment performance. If a fund claims to beat the market, it is measuring itself against a benchmark like the S&P 500 or FTSE All-Share. Most actively managed funds fail to beat their benchmark consistently over 10+ years.
Liquidity
How quickly and cheaply you can convert an investment to cash without significantly affecting its price. Cash is perfectly liquid. Index ETFs are very liquid — you can sell in seconds. Property is highly illiquid — selling takes months and involves significant transaction costs.
Income and Return Terms
Return
The gain or loss on an investment, expressed as a percentage of the original amount. A 7% annual return means £1,000 grows to £1,070 in one year. Total return includes both price changes and any income (dividends or interest) received during the period.
Yield
The income generated by an investment as a percentage of its current price. Dividend yield equals annual dividend divided by share price, multiplied by 100. A share at £10 paying £0.40 per year has a 4% yield. If the price falls to £8, the yield rises to 5%.
Dividend
A portion of a company profits distributed to shareholders, typically quarterly or annually. Not all companies pay dividends — growth-focused companies often reinvest all profits instead. Dividend payments are separate from share price movement.
Capital gain
The profit made when you sell an asset for more than you paid. If you buy shares at £5 and sell at £8, your capital gain is £3 per share. In the UK, gains above the annual CGT allowance are taxed. Inside an ISA or pension, capital gains are completely tax-free.
Expense ratio (OCF)
The annual fee charged by a fund, expressed as a percentage of your investment. Also called Ongoing Charges Figure in the UK. An ETF with a 0.20% OCF charges £2 per year on a £1,000 investment. The compounding difference between a 0.20% index fund and a 1.5% active fund is very large over decades.
Compound return
Returns earned on previous returns. In year one you earn 7% on £1,000, giving £70. In year two you earn 7% on £1,070, giving £74.90. The amount you earn grows every year even with the same percentage rate, because your base keeps growing. Time amplifies this dramatically.
Account Types
🇬🇧 UK Account Types
Stocks & Shares ISA
Invest up to £20,000 per year. All growth, dividends, and interest are completely tax-free — no annual limit on gains. The most important account for most UK investors.
Cash ISA
Save up to £20,000 per year in cash (shares the same annual ISA allowance). Tax-free interest. Not the same as investing — holds cash, not assets.
SIPP
Self-Invested Personal Pension. The government adds 25% tax relief on deposits for basic-rate taxpayers (40% relief for higher rate). Capital locked until age 57+. Highly efficient for retirement.
Workplace pension
Employer contributes on top of your contribution. The employer match is free money — always maximise it before opening any other account.
🇺🇸 US Account Types
401(k)
Employer-sponsored retirement account. Contributions reduce your taxable income now. The employer match is free money — always take the full match before anything else.
Roth IRA
Contribute after-tax money (up to $7,000 per year). All growth and withdrawals in retirement are completely tax-free. Most valuable account for younger investors at lower income brackets.
Traditional IRA
Contribute pre-tax money. Pay tax on withdrawals in retirement. Useful if you expect to be in a lower tax bracket later than you are now.
HSA
Health Savings Account. Triple tax advantage: contributions reduce income, growth is tax-free, withdrawals for medical expenses are tax-free. After 65, works like a Traditional IRA for non-medical use.
10 Questions People Actually Ask
What is the difference between a stock and a share?
Nothing, in practice — they are used interchangeably. Technically, stock refers to ownership in a company in general, while share refers to a specific unit of that ownership. In the UK, shares is the more common term. In the US, stocks dominates. You will see both in financial media and documentation without any meaningful distinction between them.
What does passive investing mean?
Passive investing means tracking an index rather than trying to beat it. An index fund or ETF simply holds all or a representative sample of the companies in its target index. No manager is trying to pick winners. This results in very low fees (0.07–0.22%) and, historically, better long-term performance than most actively managed funds, because you are not paying manager fees or the cost of frequent trading.
What is an accumulation vs income unit in a fund?
Funds typically come in two classes. Income units (also called distribution units) pay out dividends and interest as cash to your account. Accumulation units automatically reinvest that income back into the fund, buying more units without you doing anything. For investors who do not need current income, accumulation units are generally more efficient — dividends compound automatically without a tax event, particularly valuable inside an ISA.
What does tracking error mean?
The difference between an index fund performance and the index it tracks. A perfect tracker would have zero tracking error. In practice, fees, trading costs, and timing differences create small gaps. Lower tracking error is better. For major index ETFs from providers like Vanguard, iShares, and Fidelity, tracking error is minimal — typically 0.01–0.10% annually.
What is a General Investment Account?
In the UK, a General Investment Account is a standard taxable brokerage account with no tax wrapper. You can invest any amount (no annual limit), but all gains and income are subject to normal tax rules. Use this only after maxing your ISA and pension allowances. In the US, the equivalent is simply a taxable brokerage account — sometimes called a standard brokerage account.
What does rebalancing mean?
Adjusting your portfolio back to your target allocation after market movements have shifted it. If you target 80% equities and 20% bonds but equities have done well and are now 90% of your portfolio, rebalancing means selling some equities and buying bonds to return to 80/20. Most passive investors rebalance once a year. Many index funds and robo-advisers do this automatically.
What is pound-cost averaging?
Investing a fixed amount at regular intervals (for example £200 per month) rather than a lump sum. When prices are high, your £200 buys fewer units. When prices are low, it buys more. Over time this averages your purchase price and removes the temptation to time the market. For salaried workers who invest monthly from their pay, this happens automatically — which is one of the structural advantages of regular salary-linked contributions.
What does time in the market beats timing the market mean?
It refers to the consistent finding that attempting to predict the best times to invest — buying low, selling high — produces worse results than staying invested continuously. The reason: the best days in the market are often clustered immediately around the worst days. Investors who miss the 10 best days in a decade typically underperform a continuous investor by a very substantial margin. Regular, consistent investing beats trying to be clever about timing.
What is an annuity?
A financial product that converts a lump sum into a guaranteed income stream, usually for life. You hand a pension pot to an insurance company and they pay you a fixed amount monthly until you die. The advantage is certainty — you cannot outlive the income. The disadvantage is inflexibility — once bought, it typically cannot be unwound. In the UK, annuities are no longer mandatory for pension holders but remain one option at retirement alongside income drawdown.
What is the difference between gross and net return?
Gross return is the total return before deducting fees and taxes. Net return is what you actually keep after all costs are removed. A fund that returns 8% gross but charges 1.5% in fees delivers 6.5% net. After taxes in a non-ISA account, your take-home may be lower still. When comparing funds and platforms, always look at net return — gross figures can obscure the true impact of high charges over long periods.
Key Takeaways
- An asset is anything with financial value you can own. A portfolio is your total collection of assets.
- Equity means ownership in a company. A bond means lending money to a government or company at an agreed interest rate.
- A bull market rises; a bear market falls — both are normal and expected features of investing, not emergencies.
- Yield is income as a percentage of price. Total return equals capital growth plus all income received.
- In the UK, the Stocks and Shares ISA is the most important account for most investors. In the US, the Roth IRA holds that position — after the 401(k) employer match.
- Passive index investing, low expense ratios, and sustained time in the market are the three concepts that matter most for long-term outcomes.