散戶買 secondary market t-bond
a) 買賣 minimum amount 比較大(今天在 Fidelity:2.875 5/15/2043 ask yield = 5.049, min 200K)
b) 要賣掉 bid-ask spread 大一點 (2.875 5/15/2043 bid-ask 73.053-73.127, TLT bid-ask spread 1 cent)
T 2.875 5/15/2043 modified duration ~= 13.7 year
TLT expense ratio ~= 0.15%, yield ~= 4.920, modified duration ~= 16.5
T 2.875 5/15/2043 is less risky and has better yield, has no expense ratio. Larger bid-ask spread when you want to sell.