Why are 1984 pennies worth more than 1985 pennies?

1984 pennies are often worth more than 1985 pennies primarily due to the existence of a rare error variety known as the "1984 Doubled Die" penny, which features noticeable doubling in the lettering and design. This error makes the 1984 penny highly sought after by collectors. In contrast, 1985 pennies lack such significant rarities, leading to lower demand and value. As a result, the market value of 1984 pennies, particularly the error coins, tends to be higher.