Gravity models describe, and hence help predict, spatial flows of
commuters, air-travelers, migrants, commodities and even messages. They
are one of the oldest and most widely used of all social science models.
This book presents an up-to-date, consistent and unified approach to the
theory, methods and application of the gravity model - which spans from
the axiomatic foundations of such models all the way to practical hints
for their use. "I have found no better general method for use in applied
research dealing with spatial interaction... It is against this
background that the present book by Sen and Smith is most welcomed."
Walter Isard