The chart shows the oil price at which all the major Middle Eastern producers can balance their government budgets; in the Saudi case, the break-even oil price (yellow columns) is $105. The green dots show the number of years each country has before it runs out of monetary reserves. Iraq is flat broke now. Saudi and Algeria have five years, and Iran has eight.
It's not clear whether Saudi Arabia can cut spending so deeply and maintain political stability. There is no official data on poverty in Saudi Arabia, but one Saudi newspaper used social service data to estimate that 6 million of the kingdom's 20 million inhabitants are poor, some desperately so.
In order to keep the favor of the Wahhabi clerical establishment, the monarchy has allowed wealthy Saudis to provide free-lance financing for Islamist causes that Riyadh officially rejects.
http://www.meforum.org/5582/saudis-cheap-oil