A barcode unlocks Indonesia's billion-dollar informal economy.

From food carts lining Jakarta's raucous streets to wet markets in Indonesia's most remote villages, one type of barcode is becoming ubiquitous.

The quick-response code, or QR, lets customers make payments by scanning it with their mobile phones. It's fast, easy and cheap for merchants - applying for your own QR code costs less than $2 - helping it...

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