"Characteristically, the factors determining, the outcome of business efforts are numerous, and difficult both to assess and control. The sale of goods on a more or less free market is, of course, one major source of these difficulties; the disposition of buyers are subject to only limited control and prediction. They in turn are influenced by those diffuse but important factors which go under the label of general business conditions. Even within the context of a given firm there may be conditions and possible courses of action (such as personal appointments, or the performance of certain equipment) which may be beyond ready prediction and control. A great part of the efforts of entrepreneurs is directed towards minimising uncertainties."