I need more mules

I tried out the new marketplace.  It really is simple and very useful for someone who wanted to make lots of cash.  I am far from any large population areas now, so my mules take days sometimes to reach their destination.  I have a great idea, possibly the best idea I have ever had including the one about my brother and the 16 penny galvanized nail.  If I were able to research a sovereignty trade outpost, I may one day build a new trade hub on a soveriegn square anywhere I wanted.  It would cost somewhat less than resource squares, so I can put one in every neighborhood, like McDonald's.  Each trade hub would increase in numbers of caravans supported, and that number could go as high as 50?  Of course, I get to build unilmited numbers of teflon caravans puled by mules, lots of mules.  Did you notice that I spelled soveren 3 different ways?