In other words, marginal tax rates are just one factor in an options exercise strategy.

FORBES: Goolsbee: Execs Rush To Exercise Options Before Tax Rates Rise

Partly because the language is already so rich, the "marginal utility" of new words is declining: Existing things are already well described.

WSJ: Culturomics Looks at the Birth and Death of Words

In other words, I believe that marginal tax rate cuts work to stimulate the economy, but, in most cases, probably not enough completely to pay for themselves.

FORBES: The Economy Glass Getting Half Full