Swaying to the D.J. and sipping cocktails on the open terrace of a mountain side bar, a party of private-school teenagers in Prada sneakers and Chanel bags looked down over the shantytowns of Venezuela’s capital, Caracas, spread over the valley below. On the poorer outskirts of the city, residents continue to struggle with water shortages and malnutrition. And in the countryside beyond, Venezuela is falling apart , with residents lacking even the most basic services, like electricity and the police. But the wealthier areas dotting the capital have undergone a striking economic boom in recent months. Shopping malls that were deserted six months ago are bustling, and imported SUVs course through the streets. New restaurants and bars are popping up weekly in the wealthier parts of town, their tables packed with foreign businessmen, fashionable locals and government insiders. […]