Slavery is not economically efficient at all. The fact that economists pointed this unpleasant fact out is what got economics tagged with the phrase &quot;the dismal science&quot;.<p><a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;The_dismal_science" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;The_dismal_science</a>