Asset classes explained: stocks, bonds, cash, real assets and more

An asset class is a group of investments that share the same basic economics: the same kind of claim, the same main sources of return and the same main risks. A share of Apple and a share of Exxon are different businesses, but both are slices of ownership in a company, so both are stocks. A 10-year Treasury note and a 10-year corporate bond are both promises to pay fixed amounts on fixed dates, so both are bonds. Members of a class tend to rise and fall for similar reasons, and that is what makes the label useful.

Knowing the classes matters because they behave so differently. Between June 2007 and October 2026, $100 in an S&P 500 fund grew to about $511 in price alone, while $100 in a real-estate fund grew to $132 after first falling by two-thirds, and $100 in a Treasury bill fund stayed at about $100 the whole time. None of those numbers is "good" or "bad" on its own. Each is the result of what that class is.

This guide is the map for the whole asset-classes section. It explains each major class, what it pays you for, what can go wrong, how easy it is to buy and sell, and how the classes have actually behaved on real data. Every class links to a deeper page.

What makes something an asset class

There is no official list, and different firms draw the lines differently. In practice, investments end up in the same class when three things line up:

1. The legal claim is the same kind. Ownership (stocks, real estate), a loan (bonds, cash), a physical good (gold, oil), another country's money (currencies), a digital token (crypto), or a contract whose value depends on something else (derivatives).
2. The return comes from the same source. Profits, interest, rent, or nothing but a change in price.
3. The same forces move them. Stocks respond to expected profits and interest rates; bonds to interest rates, inflation and the borrower's credit; commodities to supply and demand for the physical good.

A useful test: if two investments usually go up and down for the same reasons, they are probably in the same class. If one tends to hold up when the other falls, they are probably in different ones. That relationship is measured by correlation, covered in Correlation between asset classes: how it works and why it shifts.

Three questions to ask of any asset class

• What pays me? A share of profits, a contractual coupon, rent, or only the hope that someone pays more later.
• What can go wrong? Business failure, rising interest rates, a borrower default, inflation, a collapse in demand, a currency devaluation, a hack.
• How easily can I get out? This is liquidity: how quickly you can sell at close to the last quoted price. A large ETF can be sold in seconds for a penny of spread. A house can take months and cost several percent to sell.

The major asset classes, one by one

Stocks (equities)

A stock is part-ownership of a company. Stockholders are paid from profits, through dividends and through the rising value of a business that reinvests its earnings. They are also paid last if the company fails, which is why stocks swing more than bonds and why investors have historically demanded a higher return for holding them. The basics of a share are in What is a stock? A complete beginner’s guide to shares; the role stocks play in a portfolio, and how they have behaved over decades, is in Stocks as an asset class: long-run returns, drawdowns and recovery.

Stocks are often subdivided by size (large, mid and small cap), by sector, by style (growth and value) and by country. Foreign companies are covered in International stocks and ADRs: how US investors own foreign shares. Over June 2007 to October 2026, the developed-market international fund EFA rose only 29% in price while SPY rose 411%, and EFA's deepest monthly-close fall was 60%: "stocks" is not one uniform thing.

Bonds (fixed income)

A bond is a loan. You lend money to a government or company; it pays interest (the coupon) on a schedule and returns the principal on the maturity date. The return is mostly known in advance if you hold to maturity and the borrower pays. The risks are that interest rates rise (which lowers the market price of existing bonds), that inflation erodes the fixed payments, and that the borrower defaults.

US Treasury notes mature in 2 to 10 years and Treasury bonds in 20 or 30 years, and both pay interest every six months, according to TreasuryDirect. Corporate, municipal and high-yield bonds add credit risk in exchange for more income. The pillar for this group is Bonds and fixed income: how bonds work, pay and lose value, with deeper pages on Bond duration and convexity: measuring interest-rate risk, Credit ratings and credit spreads: how bond risk is priced, Corporate and high-yield bonds: how company debt behaves, Municipal bonds: GO vs revenue bonds and tax-free yield math and Bond ETFs vs individual bonds: maturity, risk and cost compared.

Cash and cash equivalents

"Cash" in investing means more than banknotes. It covers bank deposits, Treasury bills (which mature in 4 to 52 weeks), and money market funds that hold such short-term instruments. Cash pays the current short-term interest rate and almost never loses nominal value. Its risk is quieter: after inflation, it can lose purchasing power for years. The 3-month Treasury bill yielded 0.02% in April 2021 and 5.34% in October 2023 (monthly averages), and 3.94% in September 2026.

Protection varies by product. The FDIC insures deposits at FDIC-insured banks up to at least $250,000, but it does not insure stocks, bonds or mutual funds, which includes money market funds. See Money market funds and cash: T-bills, savings and real returns.

Real estate

Real estate earns rent and can rise in value with the economy and with inflation. Owning buildings directly is illiquid and concentrated, so many investors use real estate investment trusts (REITs), companies that own property and must pay out most of their taxable income as dividends. REITs trade like stocks and, in a crisis, fall like stocks: the Vanguard Real Estate ETF (VNQ) lost 67% in price between October 2007 and February 2009 on monthly closes. See REITs explained: how real estate investment trusts work.

Commodities and precious metals

Commodities are physical raw materials: energy (crude oil, natural gas), metals (copper, gold, silver) and agricultural goods (corn, wheat, coffee). They pay no income. Their return is the change in price, plus or minus the cost of holding them. Most investors get exposure through futures contracts or funds that hold futures, and rolling those contracts from month to month can add or subtract a lot (see Contango, backwardation and roll yield: why USO lags oil). The Invesco DB Commodity Index fund (DBC) fell 76% in price from June 2008 to April 2020 on monthly closes.

Gold sits slightly apart. It is a commodity, but it is also held as a store of value, and the gold fund GLD rose from $64.27 to $368.57 between June 2007 and October 2026, a price gain of about 9.4% a year. Because gold pays no interest or dividends, a price chart of a gold fund is close to its full return, less the fund's fee. See Commodities explained: energy, metals, crops and how to own them and Gold and precious metals: how gold is priced and what drives it.

Currencies (foreign exchange)

A currency is a claim on another country's money. Its value against the dollar moves with relative interest rates, inflation, trade and capital flows. The euro was worth $0.85 in October 2000, $1.58 in July 2008 and $0.99 in October 2022 (monthly averages), and $1.1199 on October 23, 2026. Currencies are traded in pairs, mostly by banks, companies and funds, and the market is open around the clock on weekdays. An American who owns foreign stocks already owns some currency risk without trading a single pair. See The forex market explained: how currency trading works, Currency pairs and pips: quotes, lots, pip value and leverage and Forex trading sessions: Sydney, Tokyo, London and New York hours.

Crypto assets

Crypto assets are digital tokens recorded on a blockchain. Bitcoin pays no income; its value rests on what the next buyer will pay. Ethereum's token also pays for computation on its network, and stablecoins try to hold a fixed dollar value. Whether crypto is a separate asset class or a speculative corner of technology is still argued. What the data does show is size of movement: Bitcoin's monthly-close price rose from $338 in October 2014 to about $78,545 in October 2026, with an annualized volatility of about 71% on monthly returns and a deepest monthly-close fall of 76% (December 2017 to January 2019). See What is bitcoin? How it works, its supply cap and its price history, Ethereum and smart contracts: how ether, gas and staking work, Stablecoins: how dollar tokens hold a $1 peg and how they fail, Crypto wallets and custody: keys, seed phrases, hot and cold storage and How crypto markets differ from stocks: hours, venues and volatility.

Derivatives

A derivative is a contract whose value is derived from something else: a stock, an index, a bond, a commodity or a currency. Futures, options and swaps are not an asset class in the same sense, because they create no new underlying wealth: for every buyer's gain there is a seller's loss. They are tools for hedging, for speculating, and for getting exposure cheaply.

Their defining feature is leverage. One CME crude oil futures contract covers 1,000 barrels. At the September 2026 average WTI price of $97.31, that is about $97,310 of oil controlled with a much smaller margin deposit, and each $1 move in the price changes the contract's value by $1,000. See Derivatives explained: forwards, futures, options and swaps, Futures contracts explained: specs, clearing, expiry and settlement and Futures margin and leverage: initial, maintenance and margin calls.

Funds: wrappers, not classes

ETFs, mutual funds and closed-end funds are wrappers. A bond ETF holds bonds, a gold ETF holds gold, an S&P 500 ETF holds stocks. The wrapper decides costs, taxes and how you trade it, but the asset inside decides how it behaves. Leveraged and inverse ETFs are a special case, because daily resets give them returns that drift away from a simple multiple over time. See How ETFs work: creation, redemption, NAV and the arbitrage band and Leveraged and inverse ETFs: daily reset math and volatility drag.

Risk, return and liquidity side by side

The table compares the classes using the same yardsticks on the same data, so the numbers are comparable. Return is the price change only, measured on monthly closes from June 2007 to October 2026 (Bitcoin from October 2014). Volatility is the standard deviation of monthly price returns, scaled to a year.

Three things stand out. First, risk and price return are not tidily related: gold and SPY ended in a similar place with similar volatility but took very different paths. Second, the deepest falls are much larger than volatility suggests; a 15% volatility sounds mild until it arrives as a 52% decline. Third, the safest-looking rows are the ones whose returns are hidden by price-only data, which is the next section's subject.

What 19 years of prices show

The chart follows $100 placed in five funds at the June 2007 monthly close, just before the 2007–2009 financial crisis. The vertical axis is logarithmic, so equal distances mean equal percentage changes.

• Stocks (SPY) ended at about $511. The line halved by early 2009, took until March 2013 to regain its October 2007 high on monthly closes, and then compounded.
• Gold (GLD) ended highest, at about $573. It peaked in August 2011, fell 43% over the next four years and did not close a month above that peak again until July 2020.
• REITs (VNQ) ended at about $132. Property owners were at the center of the 2008 crisis, and the fund fell by two-thirds before recovering.
• Bonds (AGG) ended at about $98 and T-bills (BIL) at about $100.

That last line is the most misleading thing on the chart, and it is why every figure here is labeled "price only." A bond fund collects coupons and pays them out. Each payout lowers the fund's price by the amount paid, the way a dividend does for a stock, so the price stays roughly where bond prices are while the income goes to the holder's account. BIL holds Treasury bills that mature within months. Its price will hover near the same level forever; its return is the bill yield, which since 2020 has ranged from 0.02% to 5.34% (3-month bill, monthly averages). A total-return chart, with income reinvested, would show both funds rising steadily.

The second figure shows the deepest drawdown, the fall from a previous high to a later low, for each fund over the same period. It is a blunt measure, but it answers the question most investors actually care about: how bad did it get?

The ranking follows the claims each class represents. T-bills, short loans to the US government, barely moved. The broad bond fund's worst fall, 23% from July 2020 to October 2023, came not from defaults but from the fastest rise in interest rates in decades, which pushed down the prices of every existing bond (see Bonds and fixed income: how bonds work, pay and lose value). Stocks and REITs, the ownership claims, fell the most, and REITs fell further because property companies carry heavy debt.

The same year, very different results

Calendar-year price changes show why owning more than one class can matter, and why it is not a guarantee:

In 2008 a slump in the economy hit stocks while falling interest rates lifted Treasury prices. In 2022 rising rates and high inflation hit both at once. The relationship between classes is a feature of the conditions, not a law; Correlation between asset classes: how it works and why it shifts measures it.

How the classes fit together in a portfolio

Each class does a different job, and a portfolio is usually built by deciding which jobs matter:

• Growth over decades has come mostly from stocks.
• Stability and income come from bonds, with cash for money needed soon.
• Inflation protection is attempted with real assets (property, commodities, gold) and with inflation-linked bonds such as TIPS, none of which has worked reliably in every inflationary period.
• Diversification comes from combining classes that do not fall at the same time for the same reason.

How much of each to hold is the subject of Asset allocation: how stock, bond and cash mixes have behaved, and why mixing works mathematically is in Diversification: why spreading your investments reduces risk. The key point here is that inflation is a cost every class must overcome. Measured by the consumer price index, $100 of spending power in January 2000 had shrunk to about $50 by September 2026. A class that merely keeps its nominal value, like cash in a low-rate decade, can still lose real wealth.

Pitfalls when comparing asset classes

Price charts versus total return. As above: a price-only chart flatters assets that pay nothing and hides the return of assets that pay a lot. Always ask which one you are looking at.

Starting points. Every return number depends on its start date. Starting in June 2007, just before a crisis, makes stocks and REITs look worse and gold look better than a start in 2009 would. The same funds measured from other dates tell different stories.

Volatility is not the whole of risk. Bonds have low volatility but can lose real value for a decade if inflation runs ahead of their coupons. Cash has almost no volatility and the same problem.

A fund is not the asset class. An ETF follows an index with fees, sampling and, for commodities, futures roll costs. The commodity fund USO and the price of oil it tracks have diverged widely; Contango, backwardation and roll yield: why USO lags oil shows by how much.

Labels drift. REITs are real estate but trade like stocks. High-yield bonds are bonds but often move with stocks. Classify by behavior as well as by name.

Leverage changes the class. A 3× leveraged stock fund or a futures position is not just "more stocks." Losses compound faster, and margin calls can force a sale at the worst moment.

How the classes compare at a glance

How Finabase does it

Finabase does not label anything with an asset class or run an asset-class screener, but the markets for most classes have their own place in the app:

• Stocks and ETFs each have a symbol page with quote, chart, news and, for funds, a Holders tab: SPY, AGG, TLT, GLD and VNQ. Sectors and the heatmap break the US stock market down by industry.
• Treasury yields for ten maturities, from the 1-month bill to the 30-year bond, are on the Treasury page, with each maturity opening its own chart, for example the 10-year yield.
• Futures on stock indexes, commodities and government bonds are listed on /futures; currency pairs and 50 cryptocurrencies have their own lists with the same 1-week to 2-year return columns.

The two charts on this page are ours, built from Finabase's own monthly chart data for these funds. Like the rest of the app's charts, they show prices, not total returns with income reinvested.

Frequently asked questions

What are the main asset classes?

The three traditional asset classes are stocks, bonds and cash. Real estate and commodities, including gold, are the most common additions, and currencies and crypto assets are often counted as well. Derivatives are better seen as contracts built on top of those classes than as a class of their own.

Which asset class has the highest return?

Over long periods, stocks have had the highest return of the traditional classes, and that has come with the deepest declines. Over any particular stretch, another class can lead: from June 2007 to October 2026, gold's price rose slightly faster than the S&P 500 ETF's, although stocks also paid dividends, which the price comparison leaves out.

Is cash an asset class?

Yes. Cash and cash equivalents, such as Treasury bills and money market funds, are a distinct class with almost no price volatility and a return equal to short-term interest rates. Their main risk is that the return fails to keep up with inflation.

Are ETFs an asset class?

No. An ETF is a wrapper that can hold almost any asset class. A bond ETF behaves like bonds and a gold ETF like gold; the ETF structure affects costs, taxes and trading, not the underlying exposure.

Why did bonds lose money in 2022 if they are the safe asset class?

Because bond prices move opposite to interest rates, and yields rose very fast in 2022. The broad bond fund AGG fell 15.0% in price that year and long-term Treasuries (TLT) fell 32.8%. Holders to maturity still receive the promised payments, but the market value of existing bonds drops when new bonds pay more.

Summary

An asset class is a family of investments with the same kind of claim, the same sources of return and the same main risks. Stocks are ownership and are paid from profits; bonds and cash are loans paid with interest; real estate earns rent; commodities, gold, currencies and Bitcoin pay nothing and return only what their prices do; derivatives are contracts that borrow their value from the rest. On 19 years of monthly ETF prices the classes ranked very differently by return and by worst decline, from a 1% dip for T-bills to 67% for REITs, and price charts hid nearly all of what the bond and bill funds earned. The classes complement one another because they respond to different forces, but those relationships shift, as 2022 showed. The rest of this section takes each class in turn.