Mainz's role as a focal point of trade continues undiminished.
It dates back to the 14th C, when it was granted the Right of Guests, forcing passing traffic on the Rhine to be trading partners.
It still has the best farmers' market in the region. (People come in from as far away as Wiesbaden, Rüsselsheim and even Frankfurt)
And it has a flourishing port.
On the Rhine, of course.
But - containers being what they are - you'll find logistics clusters all over the city.
And in the background, Mainz's rubbish collection is magically converted to electricity.