Liquidity-Adjusted Losses: Why Your Paper Numbers Lie
The gap between quoted market price and actual exit price — and why it matters most when you need to sell.
Every stress test produces a number: your portfolio loses X% under scenario Y. But X% is calculated at quoted market prices — the mid-price between bid and ask. The actual loss you would experience if you needed to sell during a crisis is higher. The difference — the liquidity haircut — widens dramatically during stress events and is one of the most systematically underestimated risks in retail portfolio management.
Bid-ask spreads and their crisis behavior
In liquid markets, the bid-ask spread on most assets is small: perhaps 0.01-0.05% of the asset price. During stress events, market makers widen spreads dramatically to compensate for the increased risk of holding inventory when prices are moving rapidly.
During the COVID crash of March 2020, bid-ask spreads on investment grade bond ETFs widened to 1-3% from their normal 0.05-0.1%. High yield bond ETF spreads reached 2-5%. Some structured credit products became effectively untradeable — the bid was 15-20% below the theoretical NAV because no market maker was willing to hold inventory. Investors who needed liquidity faced the choice between selling at a 15-20% discount to fair value or holding through the drawdown.
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Not financial advice. Educational content only.