[ardy42]

>> I'm trying to imagine a physical product that is worth transporting on an interstellar level, rather than locally manufactured. It seems to me that the only thing that would ever be exchanged between solar systems, would be information.

> It is at least possible that a manufacturing ecosystem would be so difficult to develop that it would require fewer decades to transport products than to develop that ecosystem.

Or there are multiple desired products whose manufacturing ecosystems place such a burden on a system that a single system can't support them all.