TOKYO / JAKARTA -- On a narrow street behind towering office buildings in central Jakarta, Mulyono has been running a small kiosk for the past four years. Until recently, the 31-year-old small-business owner had been procuring his daily supply of goods -- grocery items like instant noodles, coffee sachets, shampoo and soap -- from local distributors. That started to change in June, when a salesman from Indonesian e-commerce startup Bukalapak showed him how to purchase his supplies on its smartphone app.

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