Liquidity refers to the ability to sell a bond quickly and at an efficient price, as reflected in the bid-ask spread.
If there is a large difference between the prices buyers are bidding, and the prices sellers are asking, there may not be the opportunity for a quick sale.
There is always a ready market for U.S. treasuries, but there may not always be for some corporate bonds, due to a thin market with few buyers and sellers.
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