What does it mean when hundreds of bond prices leave the system for about thirty discount factors with no solution?
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Bond prices as a system of linear equations
Write the system for bonds, label what is known and what is unknown, and count equations against unknowns using the 353 Treasury issues and at most 30 maturities.
Three equations in two unknowns: linear dependence
State the condition under which three linear equations in two unknowns have a solution, and set up a three-bond example in which two bonds fix the one- and two-year yields and the third fails.
No solution means a costless, riskless trade
Describe the combination of the three bonds that costs nothing today, pays cash now and owes nothing later, and state that hunting for such gaps is fixed-income arbitrage.
Salomon Brothers and the computing arms race
Record the 1970s Salomon story (200 equations, 30 unknowns, a $22 million bonus), the frictions such as callable bonds that keep gaps from vanishing, and the Cray-2 arms race.