The rules which we find laid down for the guidance of the prince in fixing prices are very interesting, as they show that the mediæval writers had a clear idea of the constituent elements of value. Langenstein, whose famous work on contracts was considered of high authority by later writers, says that the prince should take account of the condition of the place for which the price was to be fixed, the circumstances of the time, the condition of the mass of the people. The different kinds of need which may be felt for goods must also be considered, _indigentice naturæ_, _status_, _voluptatis_, and _cupiditatis_; and a distinction drawn between extensive and intensive need--the former is greater 'quanto plures re aliqua indigent,' the latter 'quanto minus de illa re habetur.' The general rule is that the prince must seek to find a medium between a price so low as to render labourers, artisans, and merchants unable to maintain themselves suitably, and one so high as to disable the poor from obtaining the necessaries of life. When in doubt, Langenstein concludes, the price should err on the low rather than the high side.[1] Biel gives similar rules: The legislator must regard the needs of man, the abundance or scarcity of things, the difficulty, labour, and risks of production. When all these things are carefully considered the legislator is in a position to fix a just price.[2] According to Endemann, the labour of production, the cost and risk of transport, and the condition of the markets had all to be kept in mind when a fair price was being fixed.[3] We may mention in passing that the power of fixing the just price might be delegated; prices were frequently fixed by the town authorities, the guilds, and the Church.[4] [Footnote 1: Roscher, _Geschichte_, p. 19.] [Footnote 2: _Op. cit._, IV. xv. 10.] [Footnote 3: _Studien_, vol. ii. p. 43.] [Footnote 4: Endemann, _Studien_, vol. i. p. 40; Roscher, _Political Economy_, s. 114.]