How have courts interpreted the phrase "as our business warrants" in the context of liability claims?

In Langenberg v. Guy, supra, the court found the general rule of liability to be inapplicable in the particular circumstances of that case. There the defendant had hired the plaintiff to haul lumber for a period of one year "as our business warrants." (77 Cal.App. at p. 666, 247 P. 621; emphasis in original.) The court found the inclusion of the phrase 'as our business warrants' to be determinative in showing that the parties contemplated the possibility that business might be reduced, even to the vanishing point, before one year expired. (Id., at pp. 667--670, 247 P. 621.)