After the first purchase of slaves in 1619 by Jamestown settlers,why were there few additional purchases of Africans in Virginia's early decades?

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In the early decades after 1619, African slaves were too costly compared to indentured servants, making the latter a more economical choice for labor in the Virginia colonies. Indentured servants, who worked for a set period in exchange for passage to the New World, provided a more affordable labor source than purchasing slaves.

After the First Purchase of Slaves in 1619 by Jamestown