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How did the Ptolemies use coinage and banks to control Egypt's economy?

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Ptolemaic sculpture — Ptolemaic dynasty Head of a queen, marble sculpture possibly made in Egypt, Ptolemaic period (305–30 bce); in the Brooklyn Museum, New York. 14 × 12 × 11.5 cm.

The Ptolemaic dynasty transformed Egypt’s economy through the systematic monetarization of the state, a fundamental innovation that allowed the monarchy to exert top-to-bottom control over financial activity.12

To maintain this authority, the Ptolemies operated a closed monetary system that restricted circulation exclusively to royal coinage within Egypt. This ensured that the state maintained a firm grip on the currency supply and the value of transactions throughout the kingdom.12

This system was supported by a sophisticated banking network that functioned through a blend of direct royal oversight and private enterprise. These banks served a dual purpose: they facilitated private financial transactions while simultaneously managing the flow of capital into and out of the royal coffers. By integrating these banking and monetary practices with strict revenue laws and state-regulated production of key commodities, the Ptolemies successfully harnessed Egypt's resources to make it the wealthiest of the Hellenistic kingdoms.12