Fundamental problems exist with the classical characterisation of aggl
omeration economies, since such definitions do not reflect the various
cost issues on which firms may wish to economise. A lack of understan
ding of the relationship between the notions of market hierarchies and
locational behaviour leads to confusion not only in applied economic
interpretation, but more fundamentally in the construction of theoreti
cal location models, In particular, neo-classical location theory can
be shown to be crucially flawed as a basis for spatial analysis, This
paper therefore attempts to provide an alternative definition of the v
arious types of agglomeration economies such that the various strands
of economic theory might be used in a more rigorous manner in the disc
ussion of spatial increasing returns.