SAN FRANCISCO — This past week, a trading card featuring the quarterback Tom Brady sold for a record $1.3 million. The total value of the cryptocurrency Bitcoin hit $1 trillion. And Christie’s sold a digital artwork by an artist known as Beeple for $69.3 million after bids started at just $100.

These seemingly singular events were all connected, part of a series of manias that have gripped the financial world. For months, professional and everyday investors have pushed up the prices of stocks and real estate. Now the frenzy has spilled over into the riskiest — and in some cases, wackiest — assets, including digital ephemera and media, cryptocurrencies, collectibles like trading cards and even sneakers.

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