  The absence of isotropic singularity in loop quantum cosmology can be
understood in an effective classical description as the universe exhibiting a
Big Bounce. We show that with scalar matter field, the big bounce is generic in
the sense that it is independent of quantization ambiguities and details of
scalar field dynamics. The volume of the universe at the bounce point is
parametrized by a single parameter. It provides a minimum length scale which
serves as a cut-off for computations of density perturbations thereby
influencing their amplitudes.
