(A) Draw a diagram that shows what happens to observed prices in posted offer and double auction markets, as the number of sellers drops to 2. Also explain in your own words what the diagram means for these two markets when there are at least 2 sellers competing against each other. (B) Draw a diagram that shows what happens in these two types of markets as the number of sellers drops to only one monopoly seller. Also explain in your own words what the diagram means for observed prices when there is only one seller. (C) Explain why part (B) illustrates the rst experimental principle