 It would of course be fatal for the true futurist theory if it could be demonstrated that it contradicts assumptions which we for other reasons should accept. Belnap and Green (1994) have argued that there are in fact such fundamental problems related to the true futurist picture. They have argued that it is not sufficient for the model to specify a preferred branch corresponding to the true history (past, present, and future): it must be assumed that there is a preferred branch at every counterfactual moment. They have illustrated their view using the following statement: