A visit to New York City reveals a metropolis transformed by a seemingly unprecedented economic boom. Numerous neighborhoods, such as the areas along the well-planned High Line park, are gentrifying and have become Euro-fashionable, with boutiques to match. Williamsburg, Brooklyn, once home to bearded Hasidic Jews, is now the Mecca of bearded hipsters and young families, and has almost become a pricey parody of itself. Condo skyscrapers are reaching new heights, both physically and in terms of dollars. Restaurants and cafes, many of them quite expensive, are filled night after night. And President Barack Obama deserves a fair share of the credit.