What is “a staple” in medieval trade?

The story behind the answer

In medieval commerce, a “staple” was a legally designated town or port where specific commodities had to be brought for sale. By forcing trade through fixed hubs, rulers could levy customs efficiently, enforce quality standards, and supervise merchants, while buyers knew where to find reliable supplies. This centralization made regulation easier and reduced risks in a world of tolls, piracy, and uncertain roads.

A famous example is the English wool staple at Calais (14th–16th centuries). The Crown granted the Company of the Staple privileges there, collected customs to fund wars, and used special “courts of the staple” to resolve disputes. While staples stimulated some urban economies and offered security to traders, they also limited competition and could inflate prices.