A Saudi woman counts Saudi riyal banknotes at a money exchange in Riyadh, Saudi Arabia in this January 20, 2016 file photo. A devaluation of Saudi Arabia’s currency could cause such political instability that Riyadh has little choice but to stick to its promise to use vast foreign exchange reserves to defend the riyal’s 30-year-old peg to the U.S. dollar. REUTERS/Faisal Al Nasser/Files
