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An excellent example of the forgetfulness of second generation modellers 
was J.R Hicks'and Lionel Robbins' simplifying assumption, made in the 
early 1930s that the given working day was of optimal length. Chris Nyland 
argued that by the 1960s, the standard approach  became to implicitly 
assume that the given working day _was_ of optimal length and 
decidedly not to consistently think back their abstractions to a 
more realistic form as Hicks had cautioned they must (1989, Reduced 
Working Time and the Management of Production, Cambridge University Press, 
p.33) 
 
Tom Walker 
 
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