With the announcement on Saturday night that Iran and the P5+1 group reached a tentative deal over the Iranian nuclear program, the Iranian rial appreciated 3.45% against the dollar on the black market. The rial jumped from 30000 IRR/USD on Saturday November 23rd to 29000 IRR/USD on Sunday November 24th. A daily appreciation of this magnitude is rare. In fact, it has occurred fewer than ten times since the beginning of 2013. Indeed, this indicates that the diplomatic breakthrough is having a positive effect on Iranian expectations.