What Is Forex, Really?

Kanin D. Alldredge, JD, MSQE

Legal & Quantitative Analyst / Author / Educator, The Currency Classroom

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Watch this lesson · 15 min. Presented by an AI avatar of Kanin D. Alldredge, narrating his written lesson. Prefer to read? The full lesson follows below.

1You've Already Used Forex

Have you ever ordered something from a shop in another country? Swapped your cash for local money on a trip? Sent money to family abroad?

If you have done any of that, and almost everyone has bought something from another country, whether knowingly or unknowingly, then you have already used forex. You just didn't call it forex. In fact, you probably didn’t call it anything. To you, it was just shopping.

So let's pull back the curtain on that word: forex.

Forex is short for foreign exchange. It is the global marketplace where the world's currencies are traded against each other: dollars for euros, euros for yen, all day, around the clock. But before that definition means anything, we have to back up and talk about something more basic.

Money itself.

You already know money. You use it every day and never seem to have quite enough. But underneath the banking apps, monetary policy, charts and the trading platforms is something you handle constantly and have probably never looked at from this angle.

2The Six-Cent Problem

Picture a twenty-dollar bill in your hand.

Here is a fact that should bother you a little. That bill costs roughly six cents to produce. Paper, ink, printing, security features. Six cents.

And yet you can walk into any store and trade that six-cent piece of paper for twenty real dollars' worth of things. Groceries. A couple of coffees.

Why? Why does six cents of paper buy twenty dollars of goods?

The answer is almost silly. It works because everyone agrees it works. There is nothing filling that gap. No gold in a vault, no hidden backing. Just an agreement.

3Money Is Trust, Printed

So here is the idea worth sitting with:

Money is trust, printed. Although "printed" isn't quite right anymore, is it? Most of your money isn't paper at all. It is a number on a screen, a balance in a banking app that you can't hold, can't touch, can't fold into your wallet. And you trust it completely. You'll work an entire month to make that number go up.

Which rather proves the point. Money was never really about the paper or the metal. It is a shared agreement that this thing is worth something. Hold onto that idea, because everything else in this lesson hangs off it.

4Every Country Prints Its Own Trust

Here is where it gets interesting. Every country issues its own version of that trust.

The United States has the dollar. Europe has the euro. Japan has the yen. Each one is a package of trust, backed by that country's economy and government.

But trust is not worth the same everywhere. Which is why, the moment you cross a border, you have to exchange the trust of one currency for the trust of another. Sometimes that is a one-for-one trade. Usually it isn't.

Which raises a natural question: how much is one country's trust worth compared to another's?

That question, right there, is forex.

5The Biggest Market on Earth

So: forex is the global marketplace where currencies get traded against each other.

And when people say this market is big, that undersells it.

Somewhere around nine and a half trillion dollars' worth of currency changes hands every single day.

A number that large stops meaning anything, so here is some perspective. Take every stock market on the planet: New York, London, Tokyo, all of them. Add up everything they trade in a day. Forex is roughly five times bigger. Every single day.

6Why Currencies Come in Pairs

Here is the thing about a marketplace where currencies trade against each other: a currency's value only shows up when you compare it to another one.

Think about it. One dollar is always one dollar. The dollar doesn't really have a price on its own. Priced in what? It needs something to be measured against.

Which is why currencies are always quoted in pairs.

The most-traded pair in the world is EUR/USD, the euro against the U.S. dollar. Say EUR/USD is 1.0850. All that means is that one euro will cost you one dollar and about eight and a half cents.

How to read that number properly, and what each half of the pair is called, is the whole of the next lesson. For now the shape is enough: two currencies, one price, measured against each other.

And that number is moving right now, all day, every day, as people decide what those two packages of trust are worth against each other. When a currency's price rises, traders say it has strengthened. When it falls, it has weakened.

7Why Trust Moves: The Three Reasons

Currencies move constantly. Why?

How do people decide a currency can be trusted more, or less?

The full answer has endless nuance, and nearly all of it fits into three categories.

7.1Interest Rates: The Trust a Country Buys

This is the big one, and the simple version goes like this. When a country raises its interest rates, holding that country's money suddenly pays you more, a bit like a savings account with a better rate. In effect, the economy is buying your trust.

The machinery is ordinary supply and demand. A better payout means more people want to hold that currency, and more demand lifts the price. What matters for a trader is that this lets you measure trust with real, published numbers.

Which is why traders watch central banks. A central bank manages a country's money supply and sets its main interest rate. The Federal Reserve does this for the United States, the European Central Bank for the eurozone, the Bank of Japan for Japan. When they so much as clear their throats at a press conference, currencies can move in seconds.

7.2Economic Strength: The Trust a Country Earns

If interest rates are how an economy buys your trust, economic strength is how it earns it.

Think of it like applying for a job. Before you hand over your labor, you want to know the paycheck will clear. Steady revenue, people showing up, a real product going out the door? You trust you'll get paid. No revenue, no customers, nothing being sold? You would be crazy to expect a dime.

A country's economy works the same way. Growing output, low unemployment, healthy exports: that is a country worth trusting your money with, and its currency tends to be in demand. Weak economy, high unemployment, uncertainty? Trust drains away and the currency weakens. Money flows toward strength and away from trouble.

7.3News and Events: The Trust That Gets Rebuilt or Wrecked

Reason three is news. Politics. The unexpected.

News is what can rebuild or wreck that trust in a single moment.

An election. A war breaking out. An inflation report far higher than anyone expected. Any of it can rewrite a country's trust story overnight.

And this one is fast. The market can react in seconds, sometimes before the article about it has finished being written. The moment trust changes, the price changes with it.

The Reason In One Line What It Does to Trust

Interest rates Holding this money pays you more. The country buys it.

Economic strength This economy actually works. The country earns it.

News and events Something just changed. It gets rebuilt or wrecked.

8Why People Trade Forex at All

That is why currencies move. So why do people trade them at all?

It mostly comes down to two reasons.

8.1Because They Have To

The first reason is practical. A huge share of that daily volume comes from companies, banks, and governments that have no choice.

Picture a French company selling to customers in the United States. It gets paid in dollars, but pays its workers and rent in euros. So it converts, constantly.

Now multiply that by every international business on the planet. Every importer, every exporter, every airline buying fuel overseas. That is most of the daily volume, and it isn't speculation. It is the plumbing of the global economy.

8.2Because They Think the Price Will Move

The second reason is speculation. That is a formal-sounding word for a simple idea: trying to profit from the price itself moving. Buy when it is low, sell when it is higher, or the reverse, which you will learn about later in this series.

This is the part that has exploded over the last twenty years, and here is why it matters to you.

Forex used to be a private club. Enormous banks and hedge funds in glass towers, institutions only. Today it is open to nearly anyone with an internet connection and a few hundred dollars. The same market those banks operate in, you can reach from the phone in your pocket.

That includes you. And that is a genuinely new thing in human history.

9The Honest Part

It would be a disservice to leave it there.

That access cuts both ways. The same market you can join from your couch moves faster than you can think, and it can take your money as easily as grow it.

Here is the good news. The people who end up doing well are almost always the ones who took time to understand the market before putting money into it. They learned the rules first. Not faster than everyone else. Before everyone else.

Which, unsurprisingly, is exactly what this series is built to do.

Three Things to Remember

Try This

Fifteen minutes, spread across one day. This is where the idea stops being abstract.

Words From This Lesson

Test Your Knowledge

Eight questions. Answer them all before checking the key on the following pages. If a question gives you

trouble, the answer key tells you exactly which section to revisit.

Answer Key

Each answer explains why the correct choice is correct, why the others are not, and where to reread if

you want the fuller picture.