What are the reasons why appellants have demurred to each cause of action?

Appellants demurred to each cause of action on the ground that it 'does not state facts sufficient to constitute a cause of action', and the first reason for reversal urged by them is that the trial court erred in overruling their general demurrer. Specifically, appellants contend that a complaint for breach of an agreement to purchase real property which fails to state the market value of the property at the time of the breach does not state a cause of action. They argue that the instant action is analogous to Employees' Participating Ass'n v. Pine, 91 Cal.App.2d 299, at pages 300-301, 204 P.2d 965, at page 966, wherein the court said: