According to section 402a of the restatement of torts, second, one who sells any product in a defective condition unreasonably dangerous to the users cannot be subject to liability for physical harm thereby caused to the ultimate user or consumer, or to his property, if .

A product that is safe when delivered is subsequently mishandled or changed.

Explanation:

This section of the Restatement of Torts explains how the seller of a good can't be held accountable of a safe delivered product if it is subsequently mishandled or changed. This protects that seller of any legal liability of, according to the example, physical harm caused to the ultimate user or consumer. To add an example: if a perfectly fine pizza is delivered but the consumer claims that it's not, the delivery won't be made accountable (as long they can prove that it was, in fact, perfect when delivered).

the factors that the economies of the muslim empires prosper were:

1- land trade routes-located between three continents  

2- sea trade routes

trade contributed to the spread of muslim empires, and with that islamic culture led to a growing feeling of internationalism resulted in the transfer of technology, science, and other cultural forms.