Signatures will vary in price with different items signed and how well the item displays the signature. Baseballs are the most common, and preferred by collectors because of it's connection to the game, low cost, availability and it displays the signature well. The signed Baseball represents the average price for a signature because it is the most collected.
Autograph photos typically sell at about 40-60 percent the price of a baseball with bats, uniform Jersey's and equipment selling at a higher price due to the higher cost of the item, rarity and display but a signed baseball would be easier to sell.
Baseball cards are a poor choice to have signed, and the signature could lower the collectible value of the card. In general, collectors of baseball cards would rather have a baseball card without the signature. The signature would be considered as a flaw in the condition of the card and will lower the value. If the signature has a lower value than the card it will lower the value of the card. The un-signed card will have a higher value.
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