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Dear Marie, 
 
Phillip Toner has a book on cumulative causation, dealing with Allyn Young, 
Kaldor, Myrdal and others. Though he does not directly engage in 
mathmatical formulation, the book should be helpful for understand the 
concept historically. 
  
_Main currents in cumulative causation : the dynamics of growth and 
development_, Houndsmills, Basingstoke, Hampshire [England]: MacMillan 
Press; New York, N.Y. : St. Martin's Press, 1999. 
 
Masazumi Wakatabe 
Waseda University 
 
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