Every morning, Sujatha leaves her home in the remote southern Indian village of Wadyal to go to work. Unlike other entrepreneurs in her village—mostly fruit and vegetable peddlers—she takes her business to her customers. She grabs a black backpack with everything she needs—including stylish eyeglasses, vision charts, referral forms, and marketing materials—and then seeks out villagers in need of glasses. By the end of the day, she will have earned about $5, making her one of the highest-earning...

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