The Arbitrage Problem. The simple Reddy Mikks model introduces some of the basic
elements of AMPL. The more complex arbitrage model of Example 2.3-2 offers the
opportunity to introduce additional AMPL capabilities that include: (1) imposing
conditions on the elements of a set, (2) use of if then else to represent conditional
values, (3) use of computed parameters, and (4) use of a simple print statement to
retrieve output. These points are also discussed in more detail in Appendix A