On a warm Sunday morning in November, Chao Dun, his wife Yumi Yan, and their toddler stroll through the Farmers Market at Marina Bay Park, where fresh vegetables are minutes away from their home. As Dun checks out tasty treats and colorful produce, Yen takes their son to the kid’s play area, offered every second Sunday at the farmers market. “The prices are comparable and affordable for organic fruits and produce,” Dun said. “And it’s not just a market, it’s…