Imagine your family owns an apple orchard. Apples are one of your family's fruit... but they also really like peaches.

​​Apples

Your friend's family owns a peach orchard. Like yours, they like peaches... but they also really like apples.

​​Peaches

When people, societies, or countries trade, both parties who are trading expect to get something extra in return for what they are offering.

Countries often trade their SURPLUS goods and services in exchange for ones they do not have or that are too expensive for them to make.

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