Question 19 (1 point) What is David Ricardo's contribution? 0 He wrote books opposing the ideas of Adam Smith. O He argued in favour of Britain following a free-trade policy. 0 He was the founder of modern economies. O He wrote An Inquiry into the Nature and Causes of the Wealth of Nations. Question 20 (1 point) Which statement does NOT accurately outline an implication of our model of trade? 0 Trade can only occur if the cost of labour in both countries is equal 0 Trade allows for specialization. 0 Trade is good for nations. 0 Trade is based on comparative advantage