Final answer:
The Specie Circular mandated investors to purchase federal lands with gold and silver to stabilize the economy and deter the use of banknotes.
Explanation:
The Specie Circular required investors to buy federal lands with gold and silver. This policy was implemented by President Andrew Jackson's administration in 1836 to ensure that only gold, silver, or land scrip would be accepted as payment for public lands. The aim was to stabilize the economy and prevent the use of unreliable banknotes.
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