Experience indicates that in the real world, several fiat monies – for example, the Canadian and US dollars in Canada – can coexist in the economy with positive values even when there are no legal barriers to the use of each one. Further, each has its own determinate demand function, quite different from the other’s. How do you reconcile this empirical fact with the analysis of the OLG model in this chapter, or are they irreconcilable without fundamental alterations in the model?