Every DeFi protocol has a question nobody asks until it's too late: when losses exceed collateral, who pays?

Most people evaluate protocols by APY or TVL. The sharper question is the loss waterfall - what happens when a liquidation cascade pushes debt beyond what the collateral can cover.

TradFi solved this a century ago. Clearinghouses run layered loss waterfalls: member contributions first, then the clearing fund, then shared assessments across members. DeFi rebuilt the same machinery with code instead of committees.

The layers worth knowing:

- Insurance funds, filled by a cut of liquidation penalties and trading fees
- Safety modules and treasuries that can be tapped, or staked, as a backstop
- Socialized losses as the last resort: bad debt spread across lenders and depositors, a silent haircut nobody voted for

A perp exchange with a thin insurance fund and heavy open interest is making a promise to future depositors it may not keep. Auto-deleveraging - force-closing profitable positions when the fund runs dry - is honest, but painful.

The real tell is history, not marketing: did the protocol ever leave lenders with bad debt, and did it publish that fact?

TVL measures deposits. The loss waterfall measures whether the deposit was ever safe.

Watch insurance fund size relative to open interest, how liquidation penalties are split, and how past shortfalls were handled. In stress, "who eats the loss" is the only line that separates durable protocols from ticking ones.

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