The Economics worksheet is automatically constructed when a rate matrix
is defined. It allows the specification of values associated with residing
in a state and moving to a new state. The state values are defined by value
rates per unit time and the transition values are fixed values that occur
whenever a transition is made. Assuming each customer experiences a cost
proportional to the time spent in the foyer, we select a cost per minute
equal to the number in the system. The time dimension of the cost rates
are the same as the dimension used for rates in the rate matrix.
