segunda-feira, fevereiro 24, 2014

Goodhart's Law

Este título "G20 chega a acordo para acelerar crescimento da economia mundial em 2%" fez-me recuar à minha leitura desta noite.
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Juro, esta noite peguei em "The price of fish" de Michael Mainelli e Ian Harris e sublinhei:
"Goodhart's Law, the original formulation being: "as soon as the government [Moi ici: Ou o FMI, ou os G20, ou ...] attempts to regulate any particular set of financial assets, these become unreliable as indicators of economic trends."
...
"any observed statistical regularity will tend to collapse once pressure is placed upon it for control purposes," oe, even more broadly, "when a measure becomes a target, it ceases to be a good measure."

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