Davidson's book on Keynes starts out providing useful information to a reader who has little or no familiarity with Keynes's contributions to economics.Davidson covers Keynes's intellectual and political views effectively.He demonstrates clearly and correctly how World War I severely inpacted how Keynes thought about social,political,and economic problems, on either a national or international plane,for the rest of his life.Chapters 8-11 covers Keynes's attempts to set up a sturdy logical,theoretical,and politically sound foundation(International Monetary Fund,World Bank,Bancor) after World War II that would prevent the types of international problems(International trade disputes,misuses of tariffs and quotas, "beggar your neighbor " trading policies,etc.) that had ,in Keynes's opinion,contributed to the outbreaks of World Wars I and II from reoccurring in the future.
Chapters 1,2,3,most of 4,7,8,9,10,and 11 can be read profitably by a general reader interested in Keynes's contributions to international trade and finance issues(balance of trade, balance of payments,liquidity-foreign debt,and debt financing problems of second and third world countries).
Severe problems arise primarily in chapters 5,6,and 12, where Davidson erroneouly claims that he is providing the reader with the correct technical model(D-Z Model) used by Keynes in the GT to illustrate his theory of effective demand.Davidson presents his own severely mathematically flawed ,Davidsonian version of Keynes's model.Davidson works only with the rudimentary, 6th grade,pre algebra outline that Keynes presented to the reader as a basic guide to what he would later actually accomplish in chapters 19,the appendix to chapter 19,chapter 20,and chapter 21, in chapter 3 of the GT.Davidson,as he has done for close to 50 years,does not tell the reader that Keynes viewed this chapter,chapter 3, as a beginner's outline that would probably be unintelligible to many readers.Davidson redefines all of Keynes's mathematical functions in the GT,replacing Keynes's definitions with his own.For instance,Davidson sets the Z function ,Keynes's expected aggregate supply function, equal to pO.Contrary to Davidson, Keynes defined D=pO 5 times in chapter 20,pp.283-284,where p is an expected price and O is a function of N;hence,it is an aggregate production function.D is Keynes's expected aggregate demand function.Keynes defined Z to be equal to WN+P on pp.23-24 of the GT.Integration of Keynes's derivatives, in those sections of the GT where Keynes did his mathematical analysis, all come out to Z=WN+P,where P is expected profit,W is the money wage ,and N is employment.Keynes defined the actual or current aggregate demand function,Y,to be equal to C+I=PO,where,in the context of the Y-multiplier model of chapter 10,P is an actual or current price(GT,p.209).Davidson redefines D,Keynes's expected aggregate demand function,to be equal to Y.None of the analysis provided by Davidson in this book has any connection with the mathematical analysis done by Keynes in chapters 20 and 21 of the GT.It should not come as a surprise that Keynes told Dennis Robertson,in a letter dated February 20,1935(see volume 14 of the CWJMK(1973),p.514(Davidson only cites from p.512),from whom Davidson has developed his Davidsonian model,that his technical analysis of Z and D is contained in a chapter in the GT called the Employment Function.Chapter 20 of the GT is called The Employment Function.
We now come to the final chapter of the book.This chapter is an attack on Paul Samuelson.Davidson claims that Samuelson has misrepresented the technical aspects of Keynes's theory of effective demand when Samuelson put forth his 45 degree cross model of income-expenditure in 1948. In fact,Samuelson's model is a brilliant simplification of the GT that allows Keynes's major insights to be presented to introductory economics student.Samuelson refrained from any serious attempt to master the technical side of the GT because Davidson's close associates,Joan Robinson,Richard Kahn,and Austin Robinson,had convinced Samuelson that there were major mathematical errors contained in the GT because Keynes had not taken their advice on economic modeling.The only conclusion possible,given the large number of errors committed by Davidson,Joan Robinson,and Richard Kahn concerning the technical aspects of the GT, is that they are the ones who are primarily responsible for killing "... Cock Robin(John Maynard Keynes)".Chapter 12 is an excellent example of the pot(Davidson) claiming that the kettle(Samuelson) is black.Davidson needs to get the dust out of his eyes before he gives advice to others having similar problems.