Have students apply each of the contract elements to the roleplay. Inform students that there are federal and state laws that prohibit merchants from misleading or deceiving consumers. Agencies enforce those laws. Brainstorm reasons for these protective agencies and law. Parties not at arms' length.
Seller has greater resources during negotiations.
Ask students if there are any arguments against having consumer protection laws. All know sales techniques. Consumers gain advantage not based on individual. No government role in private K's. Seller can avoid law, so just more paper work.