Benchmark
A reference index used to judge a portfolio's performance and risk.
A benchmark sets the standard a portfolio is measured against. The right benchmark reflects the policy's objectives and constraints, not simply the most familiar market index.
The wrong benchmark quietly distorts behaviour, pushing a portfolio to chase an index unrelated to the family's goals. The right one reflects the policy. For many families the most honest benchmark is their own required return, not a market everyone happens to watch.