SSWarlock said:
But what if said visitor wants to buy the latest high-end laptop AND get local 24-hours tech support? Or a 2008 Ferrari?
I think it is even more complex than this.
My setting is a TL 10 colony on a water world. The colonists produce
some TL 10 goods, for example diving equipment, and import some
TL 11 goods, for example electronics.
A visiting traveler could easily buy some TL 10 equipment, but not any
TL 10 electronics, because they are neither produced nor imported.
He could buy a TL 10 hydrofoil with TL 11 sensors, but he could not buy
an ATV or any kind of ground car, no matter what tech level.
In the end, if one wants to know what is available on a planet, one has
to develop that planet in some detail.