Gas prices dip below $4 a gallon on average for first time in months after Iran deal progress: Gas prices have dropped in reaction to President Trump signing a memorandum of understanding with Iran - but they're still a dollar higher than they were before the war, according to AAA data. CBS News business analyst Jill Schlesinger explains how markets are reacting to global relations. #GasPrices #IranDeal #TrumpAdministration #EnergyMarket #Economy