Shortfall
The amount by which the capital required to fulfill a financial obligation exceeds available capital.
Investopedia Commentary
Shortfall risk is often combated with an efficient hedging strategy created by a fund, group, institution, or individual. This strategy aims to protect investments from price movements. Hedging helps to ensure that the finances required for a future financial obligation are available.
See also: Delta Hedging, Hedge, Hedge Ratio, Short Selling