Supply and demand significantly impact sports card prices:

  1. High Demand, Low Supply: If a particular card or set is highly sought after but has limited availability, the price will typically increase. This can happen with rare cards, rookie cards, or cards of popular players.
  2. Low Demand, High Supply: Conversely, if there is an abundance of a certain card but little interest from buyers, the price will decrease.
  3. Market Trends: Changes in a player's performance, injuries, or retirement can also shift demand, thus affecting prices.

Overall, prices fluctuate based on the balance of how many people want a card and how many are available.

Some of the rarest and most expensive sports cards include:

  1. 1909-1911 T206 Honus Wagner: Often considered the "holy grail" of baseball cards, one sold for $7.25 million in 2022.
  2. 1952 Topps Mickey Mantle: A gem mint copy sold for $12.6 million in 2022, making it one of the most valuable sports cards ever.
  3. 2000 Playoff Contenders Championship Ticket Tom Brady Rookie Card: A PSA 10 copy of this card sold for $3.1 million in 2021.
  4. 1933 Goudey Babe Ruth: High-grade versions can fetch hundreds of thousands of dollars.

These cards are valuable due to their rarity, condition, historical significance, and player popularity.