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When selling short, the initial credit balance is the sum of the proceeds of the sale ($30,000) plus the 50% Regulation T margin requirement ($15,000) or $45,000. The beginning equity is $15,000 (CR − SMV = EQ, or $45,000 − $30,000 = $15,000). If the market value falls to $25,000, equity is determined as $45,000 minus $25,000 equals $20,000.
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