Korea has experienced a rapid rise in the number of fried-chicken restaurants and other small eateries, and economists worry the bubble is about to burst, raising concerns for owners who borrowed against their homes to start the businesses. Workers at many of South Korea's largest companies, who are required to retire in their 50s, often take on debt to start small eateries to supplement their pensions, only to find they're working long days struggling just to stay afloat.

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