What are the key factors for investing in NFL football cards?

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• What are the key factors for investing in NFL
  football cards?
• Collecting and investing in NFL football cards
  has become a popular hobby and investment
  strategy for enthusiasts and investors alike.
  Here are some key considerations
• Player Performance The performance of the player
  depicted on the card is a fundamental factor.
• Rookie Cards Rookie cards (RCs) are highly
  sought after in the trading card market.
• Autographs and Memorabilia Cards with authentic
  player autographs or pieces of game-worn
  memorabilia add value to a collection.
• Card Condition The condition of a card is a
  critical consideration for collectors and
  investors.
• The popularity of the Card Set The overall
  popularity of a particular card set or brand can
  influence a card's value.