There are various fixed income securities like, T-bills, municipal bonds and corporate bonds.T-bills are issued by federal government and are almost risk free, there is almost zero risk associated with T-bills, one of the disadvantages of T-bills is that rate of return is very low for T-bills.Municipal bonds: Municipal bonds are issued by state governments and provide tax benefits on return to investors. Disadvantage of municipal bond is that return is low on municipal bonds as well.Corporate Bonds: Bonds are issued by corporates; Corporate bonds have higher yields bur there is un systematic risk of company becoming bankrupt is associated with corporate bonds.

Question - T-Bills are low risk because the federal government can do two things corporations cannot do, what are those two things?