Define tail risk and give an example.

Define tail risk and give an example.

• A. A high-probability, low-impact event; example: minor software patch.
• B. A moderate-probability, moderate-impact event; example: quarterly revenue variance.
• C. A predictable event with low impact.
• D. A low-probability, high-impact event; example: systemic market crash or catastrophic cyber attack.

Answer: (D)

Tail risk refers to events that lie in the far tails of the probability distribution—extremely unlikely, but with potentially severe consequences. These rare, high-impact events are often underestimated by models that assume normal, well-behaved distributions, yet they can cause outsized losses across portfolios or systems. The best choice captures this idea: a low-probability, high-impact event such as a systemic market crash or a catastrophic cyber attack. These scenarios illustrate the sort of extreme outcomes that define tail risk, where the consequences are large even though the probability is small. By contrast, the other descriptions point to more common, smaller, or more predictable risks that do not exhibit the extreme loss potential characteristic of tail risk. Managing tail risk typically involves stress testing, scenario analysis, and buffers to absorb severe shocks.

Tail risk refers to events that lie in the far tails of the probability distribution—extremely unlikely, but with potentially severe consequences. These rare, high-impact events are often underestimated by models that assume normal, well-behaved distributions, yet they can cause outsized losses across portfolios or systems.

The best choice captures this idea: a low-probability, high-impact event such as a systemic market crash or a catastrophic cyber attack. These scenarios illustrate the sort of extreme outcomes that define tail risk, where the consequences are large even though the probability is small.

By contrast, the other descriptions point to more common, smaller, or more predictable risks that do not exhibit the extreme loss potential characteristic of tail risk. Managing tail risk typically involves stress testing, scenario analysis, and buffers to absorb severe shocks.