What is the benefit of buying TBills in the auctions where the rate is unknown until AFTER purchase, when buying TBills on the secondary market allows you to see the percent you will get before buying? Many brokers have lists of TBills you can buy that mature at all different dates with known interest rates. What am I missing? I realize most buy them thru the initial auctions but just trying to find out why that is better than knowing the rate you are getting before purchasing. Thank you.
