"That's right," said Berry. "And while you're trying to decide whether to have one or two pounds, they turn into bananas. Then you are done."
Jonah took up the cudgels.
"It's perfectly simple," he said. "Think of a thermometer."
Jill took a deep breath.
Then—
"Yes," she said.
"Well, on Monday you find it's fifty-six. On Tuesday you look at it again, and find it's fifty-three. That means it's gone down, doesn't it?"
"Yes," said his sister hopefully.
"Well, with the franc it's just the opposite. It means it's gone up."
"Yes."