By Jason Singer – Portland: It's early in the morning on a beautiful summer Monday. In preparation for the farmers market in Monument Square, an employee from Risbara's Greenhouse sets up a tent near Congress Street. She puts out begonias and purple impatiens. The yellow petals of her brown-eyed Susans sparkle under the pristine blue sky. Once the tent is ready to go, there's only one problem: no other farmers and no customers.