potato paradox

noun2

1. •
   A calculation having a counterintuitive result: "Fred brings home 100 kg of potatoes, which consist of 99% water. He then leaves them outside overnight so that they consist of 98% water. What is their new weight?" The surprising answer is 50 kg.
2. •
   The paradoxical nature of Giffen goods, where people consume more as the price rises.