The Sidewalk Fruit Vendor Who Sold a $6.2 Million Banana for 25 Cents

At the fruit stand where he works on Manhattan’s Upper East Side, Shah Alam sells dozens of bananas a day at 35 cents a piece, or four for a dollar. He does a brisk business in cheap fruit outside Sotheby’s auction house; inside, art can sell for millions. But last Wednesday, Mr. Alam sold a banana …