[someguyorother]

Perhaps a more general observation is that a measure that faces pressure by intelligent agents needs to be monitored and adjusted by equally intelligent agents to patch the exploits.

So you can either use a simple measure that doesn't work, or a complex measure that does work, but at potentially great cost (evaluating all the terms, bureaucratic inertia by the controllers, etc.)

Some metrics seem to provide more of a free lunch - be more robust - than others. It's not obvious which are robust, however.

[abandonliberty]

This is everything in society, and many problems arise because those manipulating the measure have more to gain by challenging it, while the checks and balances only face loss.

[damagednoob]

Sounds like this would just lead to an arms race between smart managers and smart employees.