Options greeks ranked from worst to best, by someone who doesn't really understand options. 10. Rho -- worst sensitivity, very boring, mostly ignored except by people trading very long maturities (who you should not trust anyway)
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Fact check, true; and twice as bad in FX-land where you have two rhos (or rho and phi, if you want to infuriate your risk-system engineers by giving different names to the same thing)
I would simply assume that the two rates move in parallel, thus freeing me from any obligation to think about rho again
