Full text: Introduction to papers on stochastic processes

for a stationary state. Since the economy does not conform to 
this condition one would suspect that there is indeed no reason 
why cross section and time series should give the same results. 
Again,more generally, economists have been inclined to 
interpret regressions based on cross section data as 
expressions of economic relations, possibly of cause and 
effect. These interpretations seem to neglect that the data in 
question reflect conditions belonging to different periods of 
time. Perhaps this mety be understood more easily if one were to 
think of the age distribution of a population which evidently 
depends on fertility and morbidity over a series of years past. 
Moreover,simple regressions reflect, or are influenced, by more 
than one economic relation. As I show in the last of the 
following papers the regression income-wealth reflects 
influences from one to the other,in both directions.Generally 
speaking, the fact that our economy has grown and has been 
subject to all kinds of chops and changes must distort more or 
less the pattern of the cross section data. 
I dwell on this subject because it forms the recurrent theme of 
the following papers. They purport to show the influence which 
the past has wrought on the present, and how past growth is 
expressed in the patterns and formations of the present which 
bear the imprints of events gone by. As I discovered ex post I 
-sun in a sense following the philosophy of Rene Thom with his 
stress on morphology,on the study of forms and their evolution. 
My studies suggest that past growth is closely linked to a 
certain pattern of statistical distribution,namely the Pareto 
distribution. In a stationary economy,so at least one of my
	        

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