[TheThinkTank] Insurance related to sales?

We are working on a written pricing policy, so I was interested in Jeff DeQuattro's post a few days ago.

I noticed in the Wiki a mention of insurance: "For bike and part sales you need to make sure you have proper Insurancehttp://www.bikecollectives.org/wiki/index.php?title=Insurance".

However, following the link, it wasn't clear to me which of the subtypes of insurance was relevant to sales. Can anyone explain this?

Thanks.