Separability will particularly show up when thinking about time and uncertainty. In the temporal context, L (x1,x2x)=∑B-1x is a particularly usual formulation where the i subscripts generally refer to some time periods and of course this means B-PLxo-1=xo-1 Or Xi=xI PiBi-I pi Consumption rises or falls depending on Whether the change in prices is greater or less than the discount factor the extent to Which consumption rises depends on the elasticity termSeparability will particularly show up when thinking about time and uncertainty. In the temporal context, ux1, x2,... xL   i1 L i1xi  is a particularly usual formulation where the i subscripts generally refer to some time periods. and of course this means: i1p1 pi xi 1  x1 1 or xi  x1 p1i1 pi 1 1 Consumption rises or falls depending on whether the change in prices is greater or less than the discount factor– the extent to which consumption rises depends on the elasticity term