(Bloomberg) -- Optimism is higher than ever on a group of stocks that have specialized in disappointment.

Already in November, the value of American financial firms has been inflated by more than $300 billion, the most ever for the group as it benefits from optimism over Donald Trump's presidential plans. Dealers are charging next to nothing for protective options and short sales are being covered in droves — all for stocks that have punished bulls every time comparable bouts of euphoria took hold since 1990.

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