Mungo Park, Travels in the interior districts of Africa…
“ In transactions of this nature, it is obvious that the white trader has infinitely the advantage over the African, whom, therefore, it is difficult to satisfy; for, conscious of his own ignorance, he naturally becomes exceedingly suspicious and wavering; and indeed so very unsettled and jealous are the Negroes in their dealings with the whites, that a bargain is never considered by the European as concluded, until the purchase money is paid, and the party has taken leave. ”
