This study is concerned with the question of the treatment of time in economic theory. It is a clarification of how different interpretations of the concept of time intervene in the process of building economic models and in analysing problems of change. It discusses how various interpretations of the notion of time lead to different forms of Economic Dynamics which are not necessarily compatible with each other. / This perplexing question of time is made concrete by the analysis of the writing of an eminent modern economist, Sir John Hicks. He has been very much concerned with the treatment of time in economic theory. The methods he used to try and deal with time in economic analysis, together with his commentaries on the issue, will serve to illustrate the difficulties involved.

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