eBay and Amazon provide "sellers' ratings" information based on the experiences of past buyers. This is to help resolve the adverse selection problem faced by potential buyers.

Adverse Selection

A market process in which undesired results occur due to information asymmetry between buyers and sellers, where one party has more or better information than the other.

Sellers' Ratings

Evaluations or scores given to sellers based on their performance, product quality, and customer service, often found on e-commerce platforms.