"If," he said tersely, "we could for a moment move on the subject of fiscal policy..."
"Fiscal policy!" whooped Ford Prefect. "Fiscal policy! How can you have money if none of you actually produces anything? It doesn't grow on trees you know."
"If you would allow me to continue. . ."
Ford nodded dejectedly.
"Thank you. Since we decided a few weeks ago to adopt the leaf as legal tender, we have, of course, all become immensely rich. But we have also run in to a small inflation problem on account of the high level of leaf availability, which means that, I gather, the current going rate has something like three deciduous forests to one ship's peanut. So in order to obviate this problem, and effectively revalue the leaf, we are about to embark on a massive defoliation campaign, and. . .er, burn down all the forests. I think you'll all agree that's a sensible move under the circumstances."