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@alta12, Take the scenario of upward sloping curve,
consider a 1 year duration and a coupon every 6 months. Now after 6 months you get a coupon. Now that there is upward sloping curve, for 6 months duration yeild will be less than what you got for a one year duration. So our target rate of return less than YTM (had the same money invested without coupon at the beginning)