This paper identifies a concept of structural spatial interaction. Alt
hough it is defined differently from its counterpart of structural une
mployment in economics, it attempts to define a similar idea. In econo
mics, the focus is on equilibrium in the supply and demand of labor. I
n this paper structural interaction is that which minimizes aggregate
distance travelled, subject to constraints on origins and destinations
. The structural interaction model produces an equilibrium, therefore,
in the supply and demand of movers, while identifying a spatially eff
icient trip distribution. It is portrayed as a type of relaxed interac
tion model and is illustrated using an example of structural migration
with Canadian interprovincial migration data.