This is something I'd genuinely like to know more about. Ikea sells an (ostensibly) 100% linen duvet + pillowcase set for $80; aside from the two sheets, what e

This is something I'd genuinely like to know more about. Ikea sells an (ostensibly) 100% linen duvet + pillowcase set for $80; aside from the two sheets, what else makes up the delta?