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One moment, please sildenafil citrate tablets 100mg nizagara Derivatives are essentially bets on future financial moves. Prior to the crisis, the massive markets in derivatives (over $300 trillion in notional value in the U.S. alone) were essentially unregulated, and conducted as simple contracts between any two financial firms. There was almost no public transparency or regulatory oversight of firms' derivatives books, and no assurances that firms could deliver on the bets they made. This was a major contributor to the financial collapse.