What Is International Trade? How an Export Deal Really Works

What international trade is, why it differs from selling at home, and how an export deal works: the contracts, the four flows and a full worked example.

International trade is the exchange of goods and services between countries. Put that way it sounds simple, and at heart it is: a seller has something, a buyer wants it, they agree on a price. What makes it a profession is everything that sits around that sale once a border is involved: transport over thousands of kilometres, customs in two countries, two currencies, two legal systems, and a buyer you may never meet in person.

This lesson gives you the map before the details. You will learn what international trade covers, why an export sale is different from a domestic one, the three contracts and four flows that every export deal relies on, and how they fit together in a real transaction, traced from the first email to the final payment.

If you are new to exporting, read this lesson first. Every other lesson in the academy, from Incoterms® 2020 to letters of credit, is a close-up of one part of the picture drawn here.

What is international trade?

International trade is any sale of goods or services where the seller and the buyer are in different customs territories. Seen from your side, selling abroad is exporting and buying from abroad is importing; the same transaction is an export for one party and an import for the other.

It is a very large market. According to the World Trade Organization, world merchandise trade was worth about USD 24.4 trillion in 2024, and trade in commercial services adds several trillion more. Most of that value is not oil or minerals but manufactured goods and processed food, the segments where small and mid-size companies compete.

Trade comes in several forms:

• Merchandise trade: physical goods such as dates, olive oil, cement, tiles, steel pipes or pharmaceuticals. This is the subject of this academy.
• Trade in services: engineering, software, tourism, transport or consulting sold across borders.
• Direct and indirect exporting: you can sell directly to a foreign importer, or sell to a trading company or buying agent in your own country that exports for you. Indirect exporting is simpler but leaves you with less margin and less control.

Why is an export sale different from a domestic sale?

The buyer still wants the right goods at the right price, on time. But five things change once the goods cross a border.

Each line of this table is the reason for a tool you will study later. Distance and transfer of risk are why Incoterms exist. Customs explains the HS code and the commercial invoice. Trust and enforcement explain letters of credit, documentary collections and credit insurance.

The three agreements behind every export deal

Beginners often think of an export as one contract. In reality, almost every shipment rests on three separate agreements, each with its own parties and its own rules.

1. The sales contract, between seller and buyer. It fixes the goods, quantity, quality, price, Incoterm, delivery date, payment terms, documents and applicable law. It may be a signed contract, or a proforma invoice or purchase order accepted by the other party.
2. The contract of carriage, between the shipper and the carrier (a shipping line, airline, road haulier or rail operator), often arranged through a freight forwarder. The bill of lading or the air waybill is its evidence.
3. The payment arrangement, between the buyer, the seller and their banks: a simple transfer, a documentary collection, a letter of credit.

Very often a fourth sits beside them: the insurance contract covering the cargo in transit.

These agreements are legally independent. A letter of credit, for instance, is separate from the sales contract it supports: under the ICC rules for documentary credits (UCP 600), banks deal with documents, not with goods. If your documents comply with the credit, you are paid even if the buyer later complains about quality; if they do not comply, you may not be paid even though the goods are perfect. Understanding this independence is the first step to managing export risk.

The four flows of an export deal

A convenient way to see an export is as four flows that must move in step.

The art of exporting is keeping these flows synchronised. The classic rule is that the documents control the goods and the money. With a negotiable bill of lading, the carrier releases the goods only to the holder of an original; with a documentary collection or a letter of credit, the buyer only gets those originals by paying or committing to pay. If the goods are released before the money is secured, or the money depends on documents that arrive late, someone is carrying a risk they may not have chosen.

How an export deal works, from enquiry to payment

The lesson the export process step by step covers each stage in detail. In outline, a deal goes through these phases:

1. Prospecting and enquiry: you identify markets and buyers, and a buyer asks for prices.
2. Offer: you calculate the cost for the chosen Incoterm and send a quotation or a proforma invoice.
3. Contract: the parties agree on all terms, in a signed contract or an accepted order.
4. Securing payment: the advance is received, the letter of credit is opened, or the collection terms are agreed. In some countries, including Algeria, the operation must also be domiciled with a bank (see bank domiciliation).
5. Production and packing: goods are made or sourced, inspected, packed and marked.
6. Transport and export customs: freight is booked, the goods are delivered to the carrier and cleared for export.
7. Documents: the commercial invoice, packing list, transport document and certificates are issued and sent to the buyer or the banks.
8. Arrival and import clearance: the buyer clears customs at destination and takes the goods.
9. Payment and closing: the balance is collected, the proceeds are repatriated where required, and the file is reconciled.

Worked example: extra virgin olive oil from Béjaïa to Montreal

An olive oil producer in the Béjaïa region signs a deal with a food distributor in Montreal, Canada.

The sales contract. 1,100 cartons of 12 one-litre glass bottles of extra virgin olive oil, so 13,200 bottles, at EUR 6.20 per bottle FCA Béjaïa port container terminal, Incoterms 2020. Total value: EUR 81,840. Payment: 30% in advance by bank transfer, 70% by documentary collection, documents against payment. Labels in English and French, as Canadian food labelling requires both languages. The contract is signed on 12 January 2026.

The money, part one. The advance of EUR 24,552 arrives on 20 January. The exporter now has cash to buy bottles and cartons, and proof that the buyer is serious.

The goods. Bottling and labelling take three weeks. The goods are loaded on 20 pallets, about 20 tonnes gross, into one 20-foot container. Under FCA the buyer has appointed and pays the carrier; the exporter's job is to clear the goods for export and deliver the container to the terminal, where risk passes to the buyer. The contract uses an option introduced in Incoterms 2020: the buyer instructs its carrier to issue the on-board bill of lading to the exporter, who can then use it to secure the balance.

The documents. The exporter issues the commercial invoice and the packing list, obtains a certificate of origin, and receives the bill of lading from the carrier once the container is loaded on 19 February.

The money, part two. The exporter hands the documents to its bank, which sends them to the buyer's bank in Montreal with instructions to release them only against payment of EUR 57,288. The vessel arrives in mid-March after a transshipment in Europe. The buyer pays, receives the original bill of lading, and uses it to take delivery of the container and clear Canadian customs.

The structure protects both sides reasonably well: the buyer has paid only 30% before shipment, and the exporter keeps control of the goods through the bill of lading until the balance is paid. The remaining risk for the exporter is that the buyer refuses the documents, leaving a container of oil in Montreal. The 30% advance is there precisely to cover the cost of bringing the goods back or reselling them.

Common mistakes of new exporters

• Quoting a price without an Incoterm and a named place. The same price means something completely different FCA Béjaïa and DAP Montreal.
• Treating the proforma as a formality. A proforma invoice accepted by the buyer may become the contract. Every detail on it matters.
• Shipping before the payment security is in place, for example before the letter of credit is received and checked or the advance has arrived.
• Ignoring the buyer's import requirements: labelling, health certificates, conformity marks or import licences. Goods that cannot be cleared at destination are your problem in practice, whatever the Incoterm says.
• Letting the documents drift apart. A weight on the packing list that differs from the bill of lading, or a description that differs from the letter of credit, can delay customs or block payment.
• Forgetting home-country rules, such as registration as an exporter, bank domiciliation or the deadline to repatriate proceeds.

Where to go next

You now have the overall picture. The next lessons fill it in: the export process step by step turns the nine phases into an operational checklist, who is who in international trade introduces the forwarders, brokers, banks and inspectors you will work with, and international payment methods compared explains how to choose the payment arrangement that fits each buyer.