3) Banerjee and Duflo note that: A) Parents are skeptical that there are s-shaped returns to children's years of schooling B) Parents believe in S-shaped returns to school years, and they are correct C) Parents believe in S-shaped returns to school years, but they are wrong D) Parents believe that there are large returns to primary school, and lesser returns to secondary 4) In the Malthusian model, the "good," stable, equilibrium: A) is impossible to reach, ever B) Requires that the society first pass through an unstable intermediate equilibrium C) Would be very hard to get to from an initial subsistence level of per-capita income D) both B) and C)