A peck is not a unit of currency and therefore doesn't have a direct monetary value. It's actually a unit of dry volume, historically used for agricultural products like fruits and vegetables.
The volume equivalent of a peck depends on the specific product you're measuring. However, in general:
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1 peck is equal to 8 dry quarts.
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There are 4 dry quarts in a US bushel.
So, a peck is one-quarter the size of a bushel.