Who publicly referred to slavery as a ""national crime"" that would one day bring ""national punishment""?

How do economists measure the success, or shortcomings, of the economy?

Which statement best describes evidence of a mulitcultural mix in east africa? a. because of what he learned during his pilgrimage to mecca, mansa musa was able to build a center of islamic scholarship. b. the traders of ghana brought back with them slaves from the mediterranean who taught the ghana rulers about christianity. c. clans were made up of lineages that were descendants of multiple ancestors from different regions of africa. d. swahili became a language made up of words spoken by traders along the coast of the indian ocean.

What are objects called that have value in and of themselves as well as value as a means of exchange? custom commodity money currency simple money