The written buyer agreement requirement helps ensure:

Option A is incorrect because written buyer agreements do not aim to increase home prices. Their purpose is to clarify relationships and services, not influence market pricing. In fact, transparency through written agreements helps prevent price manipulation by ensuring all parties understand their roles and obligations.

Option C is incorrect because while buyer agreements may indirectly affect transaction timelines, their primary purpose is not to speed up sales. The focus is on transparency and understanding, not transaction efficiency. Faster sales might occur with clear agreements, but this is a potential byproduct, not the main objective.

Option D is incorrect because buyer agreements typically outline commission structures, and they don't universally lower commissions. In fact, they often specify the exact commission amount or calculation method. The purpose is to establish clear terms, not to reduce compensation.