Slavery in the United States was an institution that had a large impact on the economic, political and social fabric of the country. The average price of a slave in 1860 was $800 and the economic magnitude of that price in today's values ranges from $17,000 to $266,000, depending on the index used.
In that year, there were an estimated four million slaves living in the South and it is estimated that their aggregate market value was over $3 billion then. That corresponds to $10 trillion today (as a share of GDP).
более подробная аналитика тут: http://www.measuringworth.com/slavery.php
рыночная стоимость 4 млн рабов США середины 19 в в сегодняшних ценах составляет $10 триллионов долларов.
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