Let the aggregate production function be: Y = AK + BL with A > 0 and B > 0. Denote the positive marginal propensity to save by s, the growth rate of population (the number of employed people) byn, and the depreciation rate by 8. Write down the fundamental dynamical equation of the Solow (Swan) model. Under what condition does this model have a steady state without growth in per capita capital stock? Under what condition does this model have endogenous growth