The specification above is underdetermined, in that we have not specified
any actual values for the attributes. We shall do so now, by defining
a particular company, `bogo_rex`

:

object bogo_rex { inherits( company ) incomings[0] = 10000 & (t>0) incomings[t] = incomings[t-1]*1.1 & outgoings[0] = 5000 & (t>0) outgoings[t] = outgoings[t-1]*1.5 }

The `inherits`

indicates that `bogo_rex`

``inherits''
from `company`

, meaning it has the same
attributes and the same equation relating them. It also gets some
extra equations. The ...`[0]`

equations
specify initial values for `incomings`

and
`outgoings`

, and the `(t>0)`

ones specify values at times
greater than zero in terms of the previous value.

For simplicity, all examples in this paper will assume that time starts at 0 and runs on for ever. However, it is possible --- and necessary, in real models --- to use other ranges.

Sat Nov 28 17:42:14 GMT 1998