No. of Recommendations: 2
Mike,
Now that I've had a chance to think about your bond buying experience at Vanguard, it occurs to me there might be a couple other factors in play.
#1. How YTMs are calculated depends on what assumptions are made and which formulas are used. (E.g., a standard, 360-day year or an actual, day-count year.)
#2. You need to understand the diff between 'on-the-run' treasuries and 'off-the-run' treasuries. (If you don't, then look it up.) My bet is that Vanguard swapped in an off-run bond for your order for on on-run bond, because that way they could arb the spread, plus charge a markup up to boot.
Vanguard isn't broker. It's a bucket shop that abuses its customers. (IMHO, natch.)
Charlie