The paper describes a spatial economic equilibrium in which each marke
t shows an equilibrium and the location of all producers is determined
in an optimal way. Being a very general model, in order to solve it a
number of hypotheses had to be introduced. We used the hypothesis of
Tinbergen and Bos. The system is optimised in such a way that total tr
ansport costs are minimised. Many optimal solutions are shown for diff
erent numbers of firms per sector. It appears that the optimal locatio
n for a sector having a very limited number of firms, would be the cen
tre of the region; if the number of firms increases, optimal locations
will be found in a circle around the centre. The impact of economic v
ariables-such as the propensity to consume-on the optimal location pat
tern of all firms, is also demonstrated.