Our approach is motivated by the statistical finding that the market value of fixed income instruments exhibit a low-dimensional factor structure. Indeed, a large literature has documented that the prices of many types of bonds comove strongly, and that these common movements are summarized by a small number of factors. It follows that for any fixed income position, there is a portfolio in a few bonds that approximately replicates how the value of the position changes with innovations to the factors. For loans and securities, the replication portfolio is derived from detailed information on the maturity distribution provided by the call reports. For loans reported at book value,.
