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Rome didn’t “decline” in the third century so much as it got repriced, brutally, by its own army. We open with one of the most jaw-dropping moments in political and monetary history: after murdering Pertinax, the Praetorian Guard auctions the Roman throne from behind the walls of their camp. That single act reveals the hidden reserve price of the empire: the payroll of the soldiers who can make or break an emperor.

From there, I walk you through how Roman public finance backs itself into a corner. Conquest stops paying for itself, border defense gets more expensive, plagues shred the tax base, and Rome lacks modern tools like a central bank or a sovereign bond market. When cutting spending is lethal and raising taxes is politically explosive, emperors reach for the mint. We track debasement from Septimius Severus onward, Caracalla’s tax-driven expansion of citizenship, and the coin trick that pushes good money out of circulation as people hoard silver and spend the “garbage” coins.

We also zoom in on the surprisingly sophisticated Roman banking system: the argentarii, book transfers, legally binding ledgers, trade finance instruments, and why credibility is a financial product. Then we watch it unravel as inflation rises, payment crises freeze credit networks, and interest rate caps turn real returns negative, echoing modern lessons about price controls and disintermediation. We end with Aurelian’s attempted fixes, the mint revolt, and the arrival of Diocletian stepping into the wreckage.

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