就用slow_quick的例子， 感觉我有点象hhtt和slow_quick的助教
面值$100, 6个月付一次利息
Interest rate = annual coupon rate (由财政部根据auction结果定）= 4.125%
6 month coupon payment = 4.125%*100/2 = $2.0625
0 6m 12m 18m 24m
$2.0625 $2.0625 $2.0625 $2.0625 + $100
High yield (由auction决定）= 年化收益率 = 4.139%
6 month 收益率 = 4.139%/2 = 2.0695%
Price for 2 year treasury notes = 2.0625/(1+0.020695) + 2.0625/1.020695^2+2.0625/1.020695^3+(100+2.0625)/1.020695^4 = $99.973391
由auction产生的High yield决定债券价格。 付$99.973391买面值$100的两年债券，每六个月拿利息$2.0625, 若持有两年， 到期后拿回$100, 年化收益率就是 4.139%。
