Decision Variables and Constraints  Discuss the selection of the decision variables. Are there alternative

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Decision Variables and Constraints

Discuss the selection of the decision variables. Are there alternative formulations of the model based upon other decision variables? Should the variables be constrained to be integers? What are the implications of these additional constraints? Is there any useful information that can be obtained from the shadow prices of the constraints? Can you provide an estimate of the number of variables and the number of constraints involved in a typical fleet -composition problem? Time Horizon and Number of Time Periods The model considers only one time period, corresponding to the year 1982. Why not use a multiperiod planning model? How can one study the dynamic issues associated with developing the proposed fleet for 1982? What would be a reasonable way of exploring the evolutionary development of one fleet from 1970 to 1982.

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