English: This is a diagram showing how merchandises or goods move in the supply chain during an international trade (import-export) operation across neighboring countries.

The poster shows how a specific merchandise, in this case avocado, moves along the supply chain between two hypothetical nations, Country "A" and Country "B" during the import and export of said merchandise. In this case, Country "A" is the exporter of the avocado, making Country "B" the importer. It also specifically shows that a nation is not the one who is exporting the merchandise, but rather a private individual. It also shows where the importing nation, in this case Country "B" may apply tariffs. The red arrows shows in a nutshell the long and sometimes bureaucratic voyage an avocado takes through the international supply chain, from the harvest of the avocado farm to the supermarket selling the avocado.

It is important to note this modality of international trade shows only supply chain by land (i.e. on roads or railroad) between two neighboring nations separated by a river. There are cases where countries may or may not be neighbors, or when neighboring countries may or may not share a river or water body as an international boundary line. But in general the import-export actors are the same and is simplified for a general audience who wants to understand clearly the basics of import and export.