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Bond ETF Duration Math: Why 1.46%p Meant -21%

A bond ETF with a duration of 17 years loses roughly 17% when rates rise 1%p. Korea's 30-year government bond yield rose 1.459%p this year — and the ETFs tracking it fell 25.39% on average. Here is the arithmetic behind that.

Korea's Early Pension Discount: Break-Even at Age 76

Claiming Korea's national pension early cuts 6% per year, leaving 70% if you claim five years ahead. Running the numbers on a 1 million won monthly benefit puts the break-even at 76 years and 8 months; deferral flips at nearly 84.

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