“The Saudi economy was in idle mode for 20 years,” said John Sfakianakis, the chief economist at SABB, who is based in Riyadh. “Today, the feeling here is, ‘We’ve won the lottery; let’s not waste it.’ “

The kingdom’s lofty economic goals would have been unthinkable without the surge in energy prices that has filled the coffers of oil producers. Oil prices have quadrupled since 2002 and reached $100 a barrel in New York this month. Persian Gulf countries earned $1.5 trillion in oil revenue from 2002 to 2006, twice as much as in the previous five-year period, according to the Institute of International Finance, a global association of banks that is based in Washington. As the top exporter, Saudi Arabia has been the main beneficiary. Despite all the recent headlines about Middle East investors bailing out troubled American banks like Citigroup, a growing share of today’s petrodollars are staying at home to finance megaprojects like Petro Rabigh, analysts say. That money is financing the biggest economic boom in a generation, helping to build not only the high-rises of Dubai, where the world’s tallest tower is going up, but also telecommunications networks, roads and universities throughout the Middle East.