Merchant Campaigns

I hope Merchant Campaigns aren't dull as I am working on one now.  Are there
any ideas for adventures beyond buying and selling, 'special' cargoes,
illegal cargoes, etc.?  I'm using Clavell's Book Taipan for inspiration
and ideas.  Are there any other books to use as reference?

All thoughts and observations welcome!

Thanks,
Allen Waddell