A number of contemporary models propose that the universe was contracting prior to expansion. However I have found this critique of such a proposal from Geroge Elliss: “initial conditions have to be set in an extremely special way at the start of the collapse phase … in an acausal way (in the inﬁnite past).” If this model is true, it rests on a knife-edge of fine-tuning. However, all the careful setup must be done over an infinite distance in the infinite past. This is troublesome to say the least. Indeed, it is partly to avoid acausal fine-tuning that cosmic inflation was first proposed. Secondly, however, “the collapse phase is unstable, with perturbations increasing rapidly, so only a very ﬁne-tuned collapse” would yield the universe we see today. As a result, the model rests on a knife-edge with no feasible way to find its balance. Although this model involves an infinite past, it is not very popular for these reasons." Any thoughts, is Ellis right if so why are so many cosmologists working on collapsing prior contracting models?