The boom that adorned Gulf Arab monarchies with glittering towers, swelled their sovereign funds and kept unrest largely at bay may be over after oil prices dropped by almost 50 percent in the last six months. The sheikhdoms have used the oil wealth to remake their region. Landmarks include man-made islands on reclaimed land, as well as financial centers, airports and ports that turned the Arabian desert into a banking and travel hub. The money was also deployed to ward off social unrest that spread through the Middle East during the Arab Spring. “The region has had 10 years of abundance,” said Simon Williams , HSBC Holdings Plc’s chief economist for central and eastern Europe , the Middle East and North Africa. “But that decade of plenty is done. The drop in oil prices will hurt performance in the near term, even if the Gulf’s buffers are powerful enough […]