Final answer:
The dollar value of the deadweight loss from prohibiting trade is the loss in social surplus due to market inefficiencies caused by price controls, depicted as the area U + W in the provided figure.
Step-by-step explanation:
The dollar value of the deadweight loss created as a result of prohibiting trade in a market refers to the loss in social surplus that occurs when the economy produces at an inefficient quantity. The inefficiency typically arises because price controls prevent willing buyers and sellers from engaging in transactions, leading to a decrease in the total surplus of society. In the provided example, this inefficiency results in a deadweight loss illustrated by the area marked as U + W in Figure 3.24(a).
Though the dollar value of the deadweight loss is not explicitly provided in the question, it can be calculated using market data that includes supply and demand curves, equilibrium prices, and quantities. The deadweight loss is graphically represented as the area between the supply and demand curves that is lost due to the imposition of the price control. This area would have represented beneficial trades between consumers and producers that are no longer occurring due to the non-market intervention.