Supply/Demand not shown?

[macmgr]

Just bought all but my "pet city" last turn. Went to peek with a spy, and Athens showed a normal city screen, except nothing was there for supply/demand. Checked again after another turn, same thing. Any idea why this would happen? I've never seen it before in 20+ years of playing.

 

[Prof. Garfield]

The Greeks must not have the Trade technology.

 

[macmgr]

Nope, they were sending out caravans pretty regularly up to now. It's 1705 AD (I'm not into the fast-finish game). Here's the save if you want to take a look.

 

[macmgr]

OK, now that's really weird - checked the intelligence and they don't have Trade. Can a civ lose an advance? I know they were trading previously!

 

[simpeter]

It's happening in my current game, and in the cities of civs both with Trade and without.
You can still see the trade routes though.