Let me get this right. A people who don't work on Saturdays, are well known for their love of unleavened bread and wine and generally are not seen as skilled labourers - also a minority within that particular population - boycotted trade with the world directly around them?

This world around them which was known for fastidious note-taking, record keeping and documenting observations in nature?

You'll be able to cite some sources in that case Telia. I'd love to know the motivations behind stopping flour production and somehow bypassing border control for food and wine made elsewhere. There could be a book or two in that!