  The Ramsey model, first introduced by F. Ramsey in 1928, has become a
cornerstone in the economic growth theory. Combined with the Solow model in the
1950s by the economists Cass (1965) and Koopmans (1965), it is still one of the
most used neoclassical growth models. Due to its general and universal
structure, it is widely used in various applications. Thus, many versions,
including the effects of taxation, government spendings and population growth
exist (see amongs others Sorger (2002), Barro (1990), and Acemoglu (2009)).
  The central idea in the Ramsey model is the endogenous saving rate, which is
determined within the optimization process in the model via a lifetime utility
maximization approach in the consuming sector. Though originally only time
dependent, the Ramsey model has been spatialized in the last two decades in the
context of the Economic Geography, started by Krugman (1991). The first who
introduced a spatial version of the Ramsey model was Brito (2001). This local
version of the spatial Ramsey model assumes that the capital accumulation
process in time and space can be modeled as a heat equation, with a local
diffusion operator to describe the mobility of capital across space. This
assumption has not been contested until today.
