A good friend of mine reported yesterday that she had driven to the brand-new Mercer Island Farmers Market to shop. She’s a Columbia City market regular, but had missed Wednesday night and just hopped the lake to pick up weekly supplies for her family of four’. A. discovered that the Mercer Island market presented some slight cultural differences from the one at Columbia City. “Only one stand in three sold produce,” she reported back. “The other two sold prepared foods.” (Not that she wasn’t buying.)And as she was leaving the market, two people stopped her — one the market organizer — to comment on the bags in her cart. “My goodness!” both said, looking shocked. “You certainly have bought a lot of food!”