Nothing like nationalism is discoverable elsewhere, for the social conditions for it did not exist. In fact, if anything the forces which were later … - Eric Hobsbawm

First, utopianism is probably a necessary social device for generating the superhuman efforts without which no major revolution is achieved.

Words are witnesses which often speak louder than documents. Let us consider a few English words, which were invented or gained their modern meanings, substantially in the period of sixty years with which this volume deals. They are such words as 'industry', 'industrialist', 'factory,' middle class,' 'working class,' and 'socialism.' They include 'aristocracy,' as well as 'railway,' 'liberal' and 'conservative' as political terms, 'nationality,' 'scientist,' and 'engineer,' 'proletariat,' and (economic) 'crisis'.

From the historians' point of view these assumptions must be realistic or they are junk. If we use the assumption of perfect foresight by businessmen to construct data, the question of its empirical validity is crucial. Altering the assumptions, whether about the model or about the data, can make a substantial difference to both the data and the answers.