AFAIK, economy on M&B is pretty primitive. Don't bother with this data.
That said, if you want to make most of profits, build the velvet one (the most expensive, 10k) on every town but Jelkala... And on Jelkala build the 8k hides one. You will make 10-12k a month without the need to buy supplies manually for your enterprises neither sell their produced goods manually in other towns.
Just let the profit come!