Why can ten futures contracts on \$300,000 of cattle cost nothing to enter, and who pays when a loss outruns the margin?
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Notional value of a futures position
Write notional value as contract size times futures price times number of contracts, compute it for ten live-cattle contracts at $0.7455 per pound, and record that no money changes hands.
Marking to market the daily profit and loss
Work the move from $0.7455 to $0.7435 into an $800 loss for the long, and record the daily transfer between the margin accounts and its reversal if the price returns.
Margin rules and the limits of liability
Record that daily settlement caps credit risk at one day's move, that a missed margin call closes the position, that margin is no ceiling on losses, and the roughly 99% target.
The clearing corporation
State that it stands as counterparty between hedgers and speculators, absorbs the residual risk when losses exceed margin, and aims to sustain an efficient market rather than maximize its own profit.