The difference between cash flow and profit, explained

A company is ‘in the black’ if it is profitable

If a company is “in the red,” however, it is unprofitable. The expressions stem from the days before computers were widely used in accounting, when accountants updated financial data in their books by hand, using different colored ink (black and red) to signal a company's profitability.

Credit card companies make money through interest, annual fees, and more

They also profit from interchange fees, the fee the retailer has to pay the credit card network in order to facilitate a transaction. The fee is typically between 1% and 3% of the transaction amount.

A cost basis is an asset's purchase price after accounting for certain other factors

If you bought a share for $5 and sold it for $140, your capital gain would be $135...on paper, at least. In reality, the math is fuzzier. Capital gains are actually the difference between the sale price of the asset and your cost basis.

Nearly 3 million people fly in and out of US airports every day—but not all of those passengers generate revenue for the airlines they purchase their tickets from.

Banks make money by loaning customer deposits and earning interest

This means the interest you earn on your deposits is lower than what the bank earns on the same amount. Banks often keep cash reserves (though a minimum requirement was rescinded in 2020) but generally invest in government bonds, corporate securities, and loans to other banks. During bank runs, depositors withdraw more than the bank has on hand.

Watch this video to learn how to read a company's earnings report, the documents that reveal key details about a public company's recent financial performance.

Compounding, explained

During conversations about personal finance, the term "compounding" gets thrown around—but not everyone understands how compound interest and compound returns work. Broadly speaking, compounding is what happens when you not only earn returns or interest on your original investment, but also on the accumulated returns or interest you receive over time. This article explains how both of these processes function, and what compounding could mean for your wallet.

Credit unions, explained

Proponents of credit unions often point to the fact they’re not-for-profit cooperatives instead of for-profit businesses as a key selling point. This explainer dives into what this looks like in action—instead of pocketing the profits from interest rates, credit unions reinvest that money into the products and services they offer. For customers, this tends to create a more personal and community-oriented experience.

What's the difference between a stock and a share?

While the words "stock" and "share" are often used interchangeably in casual conversation, they have different meanings. For instance, "stock" is more general, whereas "share" is more precise.

Where colleges get their money, visualized

If you're curious about how different colleges and universities generate their revenue, this National Center for Education Statistics webpage offers a clear visual breakdown. See how public, private nonprofit, and for-profit institutions fund their operations, highlighting the differences between funding sources depending on the type of institution.

Explore the differences between private equity, venture capital, and hedge funds

Private equity firms focus on buying and improving private companies with the intent to sell them for profit or take them public. Venture capital is technically a form of private equity in which investors focus on startups and generally don't seek majority control of the company. Hedge funds are pooled investments for sophisticated investors that pursue a wide range of often complex strategies.

Amazon's largest profit engine is its cloud-computing platform Amazon Web Services, which generated over 60% of Amazon's total operating income in 2024.

While the Fed is involved in issuing new generations of cash, the way it adds to the money supply does not involve printers

The majority of money in circulation is credit, not cash. This credit, which acts similarly to direct deposit from employers, is added to bank accounts by the Federal Reserve. The Fed also employs tools like the federal funds rate and open market operations to expand or contract credit.

Private credit is a nonbank loan made directly to a business

Similar to private equity, private credit is part of the private markets world. Both strategies offer illiquid, privately negotiated investments for privately held companies. Unlike private equity investors, however, private credit investors typically do not take ownership stakes in the companies they invest in.

The difference between marketing and advertising: Advertising is technically a type of marketing

While the terms are often used interchangeably, technically speaking, marketing is any effort to promote a product or service. Advertising, on the other hand, is any paid effort to promote a product or service. Learn more about the difference in this article.

A 'position' in financial markets refers to the amount of a security or asset that an investor owns or sells short

A "long" position gains from an increase in a security's price, whereas a "short" position profits from a price drop. This article includes a detailed explanation of the term "position" as it relates to investing and financial markets.

College football generates over $13B annually—but many programs run at a loss.

Private equity deals sometimes come with layoffs.

Proof-of-work versus proof-of-stake: what's the difference?

The two main consensus mechanisms—the way blockchains confirm and enshrine information—are proof-of-stake and proof-of-work. An overview compares the differences between the two and the latter's ability to reduce the energy intensity of the computation process, which has emerged as one of the biggest criticisms of the crypto boom.

Visualize the balance sheets of US banks

The US banking industry is the most profitable in the world, with loans and leases driving the lion’s share of those profits. In fact, at the end of 2022, 53% of all bank assets fell into the loan and lease category. This rich visualization makes sense of that and highlights how traditional banks operate in stark contrast from their not-for-profit credit union peers. See it here.

What are business credit scores?

Businesses have credit scores the same way individuals do—with a few key differences. For one thing, business credit scores range from 0 to 100 instead of 300 to 850, and are based on factors such as bankruptcy and bill-paying habits.

ETFs and mutual funds are both taxed on capital gains and on dividends.

Reinvested dividends are not a way to dodge paying capital gains taxes

When an investor holds stock in a company that pays a dividend—a portion of its profits directly returned to shareholders as monthly or quarterly payments—they can choose to hold that dividend in cash, spend it, or reinvest it into more shares of that company’s stock.

Visualize the differences between the New York Stock Exchange and the Nasdaq.

The drastically different seat tiers on airplanes are a prime example of 'price segmentation,' which is key to keeping airlines profitable.

Use a prediction market profit or loss calculator

In order to calculate how much someone would make from a specific trade on a prediction market, this calculator asks for the purchase price of a given "yes" or "no" prediction, the number of contracts the trader plans to purchase, and more.

Amazon didn't have a profitable quarter until 2001, more than 6 years into its existence

Jeff Bezos, however, took pride in Amazon's early unprofitability, reinvesting the money Amazon made back into its business, prioritizing investment into long-term growth and customer acquisition over short-term gains.

Private companies are often harder to value than public companies

That's partly because there isn't readily available stock information, and financial accounting is kept behind closed doors. Typically, determining the value of a private company involves, among other things, closely comparing the private company with its competitors.

Laminar flow moves in smooth, parallel layers, while turbulent flow is chaotic

In laminar flow, particles that make up a fluid move in consistent paths that do not cross each other. Contrastingly, differences across the speed of these particles cause them to mix, creating turbulence when viscosity cannot suppress the differences.

Learn how tax credits are applied to income taxes

Tax credits are directly subtracted from the amount of money taxpayers owe on their annual income. Unlike tax deductions, credits reduce the owed amount while deductions reduce how much income is taxable. There are different types of tax credits that are either fully or partially paid out.

Learn how to calculate your net worth

Someone's net worth is the value of their assets minus their liabilities. Assets may include a home or a retirement savings account, whereas examples of liabilities include student or credit card debt.

40 key stock market terms, explained

Liquidity. Forex. Capitalization. Blue chip stocks. These are just a few pieces of stock market vocabulary most people who don't spend all day on a trading floor might not know. Thankfully, we found a fun infographic that makes it easier to learn what 40 key stock market terms mean and why each of them matters.

How life looks different with a $75K household income versus $150K

"The cleanest way to describe the gap is that $75K is often about stability, while $150K can be about optionality, but only if fixed expenses do not expand to consume the raise," said one finance professor.

American Express is both a card issuer and a processing network

Unlike most credit card companies, American Express issues credit cards and processes payments—something called a closed-loop model. By offering both services, American Express profits from both interest and interchange fees, and also has access to more data on how customers spend their money so it can offer better perks.

Jet fuel is expensive—which is one reason why it's tough to make an airline profitable

Jet fuel is typically a commercial airline's second-largest expense, second only to labor. Oil prices can be volatile—there have been recent significant increases in jet fuel prices given the 2026 Iran conflict, for instance.

Although credit unions offer many of the same services as traditional banks, they differ in that credit unions operate with not-for-profit status and are run by and for their members.

Open-end and closed-end mutual funds differ in how they create and distribute shares.

How fee-free Robinhood makes money

Robinhood is both loved and hated by retail investors. Although its mobile app is easy to use and transactions on its platform are fee-free, many individuals have taken issue with a controversial practice that drives 75% of its revenues. Robinhood uses payment for order flow, essentially taking payment from other brokerages to redirect users’ trades. Read up on how PFOF works here.

Family CEOs tend to prioritize a non-economic goal: keeping the business in the family

Companies led by family CEOs tend to prioritize corporate social responsibility, but they also tend to invest less in innovation and international growth. They also have more debt on average.

ETFs and mutual funds both pool money into a basket of investments—but the key difference between them is that mutual funds trade just once per day after the market closes, while ETFs trade like stocks throughout the day at fluctuating prices.

BTS makes big profits, and spends just as big

While the band has been on hiatus since 2022, there are remarkable insights into the band’s success, like a $44M profit from a six-show tour. Their profits allow them massive spending, with investments like a shared mansion in addition to owning their own multimillion-dollar apartments.

An expense ratio represents the cost to own an ETF over the course of the year

For instance, an expense ratio of 0.5% would add a cost of $50 on an investment of $10K. And while expense ratios have on average decreased in recent years, a particularly hefty fee can still eat into total profits.

Savings accounts earn more interest and limit monthly transactions

While the checking account is many people's primary daily account, savings accounts can earn customers more in interest, though access to these funds is generally more limited. Customers can earn several percent interest in savings accounts compared to near-zero checking account rates.

Escrow is when a third party holds on to the money during a financial negotiation between two other parties

In the homebuying process, escrow typically happens while the buyer and the seller negotiate the terms of the sale. Escrow accounts can also be used to hold a buyer’s money when making payments on their loan.

The difference between solstice and equinox, explained

A solstice marks the extremes in the amount of day or night, while the equinoxes come on days with a balance between the two. Learn why with this brief video.

Friction is the force that resists the sliding of surfaces along one another

Friction always acts to resist movement and is determined by how rough the surfaces are and how hard they are pressed together. In the case of fluids, friction arises from the relative motion between adjacent fluid layers, which act like sliding surfaces.

Carried interest is a share of the profits that a venture capital firm’s general partners earn

Also known as "carry" for short, carried interest is roughly 20% of a fund’s returns, but the exact percentage varies between firms.

Charge cards are different from credit cards

Unlike credit cards, charge cards often don’t have a preset credit limit, but cardholders need to pay off the entire balance every month.

Permanent life insurance offers access to a cash value account, which is like a savings account

It's a huge perk of purchasing permanent life insurance. Policyholders often use these accounts as another investment tool. In this podcast episode, NerdWallet experts break down how you can use your cash value account to invest, plus the pros and cons of this tactic.

Read about different levels of price discrimination

Price discrimination is a business practice in which different customers are charged different prices for the same product or service. It's one way for a business to boost profits and take advantage of its market position. There are three levels of price discrimination, differentiated by the consumers targeted and the reasons for discrimination.