They didnt ask the trade question again. This year it was question 1 - how isoquant/isocost parallels budget/indiff...
no elasticity
was question on public goods - what are they, optimal provision, why its pareto inefficient to exclude, why markets cant provide
price ceiling/floors - what are they, why non-price factors are important , specific tax, welfare loss
perfect comp/monopoly
diminishing returns
oligopoly
it was alright i thought. lucky i knew public goods and price ceilings/floors... the others i knew nothing