Get automotive news, DIY tips, market trends, in-depth car profiles, and more right in your email inbox. The Hagerty Price Guide Indexes—first published in 2009—are a series of stock market-style indexes that average the condition #2 (“excellent”) values of representative vehicles, or “component” cars, from a particular segment. These indexes are updated quarterly and provide an overview of how these segments of the collector car market are performing overall, as well as relative to each other.