This study estimates a multiproduct translog cost function for the ent
ire population of 1011 Flemish secondary schools in order to determine
the degree of ray and product specific (dis)economies of scale as wel
l as the degree of(dis)economies of scope. Three types of schools and
seven major study fields can be distinguished. Student loads in these
study fields are used as outputs produced by the schools. Evidence is
found for ray economies of scale for the three types of schools, even
at output levels of 300% of the actual means. Although the cost elasti
cities of six out of seven outputs are close to zero, most of the valu
es indicating the degree of product specific economies of scale are ne
gative (suggesting diseconomies of scale). However, this can be explai
ned by the considerable scope effects which are incorporated in the de
finition of the product specific economies of scale.