 Tim Maudlin (2007) has replied to Price that the rate of one second per second is a perfectly fine rate. Consider, he says, a fair exchange rate (based, say, on purchasing power parity) for currencies. The fair exchange rate for the British pound might, at some time, be 1.52 US dollars per pound. Similarly, Maudlin observes that the fair exchange rate for the US dollar with respect to itself must be 1 US dollar per US dollar. “If you think that this answer is meaningless,” Maudlin writes, “imagine your reaction to an offer of exchange at any other rate” (2007, 112).