Every morning for the past six months, Isaac Kahan has left his house at 3:30 a.m. to begin his workday on the stretch of 47th Street that comprises New York City’s bustling Diamond District. Buying and selling gold has never been a busier vocation. As the president of Bullion Trading, he sells about $1 million in gold from his storefront every day. Though 1-ounce bars are his most popular offering, Kahan has taken to selling quantities of gold that are so tiny they would have been unthinkable a year or two ago—as little as 2.5 grams, for around $500. “I keep on telling my wife that this is a once-in-a-lifetime ... (full story)