 Next, the stamp-dealer takes out stamp \(B\) from a drawer, and offers her to swap \(C\) for \(B\), against another payment of 10 cents. She accepts, thus moving from the state \(\langle C,10\rangle\) to \(\langle B,20\rangle\). The shop-owner can go on like this forever. What causes the trouble is the following sequence of preferences: