Final answer:
The problem with the Coase Theorem is that transaction costs can be high in many situations.
Step-by-step explanation:
The problem with the Coase Theorem is that transaction costs are high in many situations. Transaction costs refer to the costs incurred when parties involved in a transaction negotiate and come to an agreement. In many real-world situations, it can be difficult and costly for parties to reach an efficient outcome through negotiation, which undermines the effectiveness of the Coase Theorem.