Text: In fact, if I understand the rules, a $17 billion foundation will have to give away roughly $170 million per quarter and, in today's market and economy, ought to have considerably more than that to spend, even after hedging against inflation.
Entailment: A foundation would not only have to give away $170 million every quarter, but also still have much more to spend after that.
Contradiction: A foundation worth $170 billion would not have to spend a dime.