re: How does the free market and economy work in the Harry Potter Universe?

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I wanna know what Harry's parents did that they were able to leave him all that gold

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His parents actually never worked. From the moment they graduated Hogwarts, they joined the fight against Voldemort. The Potter family was a strong wizarding family that went back a very long time. They descended from the Peverell brother that created the invisibility cloak deathly hallow, after all. Like many of the wizarding families that could trace their lineage back a long time (Malfoys and Blacks), they had amassed a fortune over the centuries. It is almost a patrician/plebeian type of society where the ancient wizarding families are the nobility.