דברי הימים ב, פרק ט׳, פסוק כ״ח

King Solomon established a vast international trade network that dominated the market for riding and chariot horses. People from Egypt and various other nations exported their horses, bringing them directly to the king [מצודת דוד].

Beyond simply importing these animals for his own use, Solomon also acted as a major international broker. His servants managed a lucrative trade in Egyptian-bred horses, supplying them to other nations that needed highly trained animals for their own chariots [ביאור שטיינזלץ].

Because he controlled these critical trade routes, the financial benefits were massive. Every tax paid by merchants exporting horses from Egypt, along with the taxes levied on the horse trade from all other kingdoms, flowed directly into Solomon's royal treasury [רלב ג].