The real trick to making big bux trading is knowing when to stop.
Maybe taking (for example) niobium from the Taus to say, Manhattan
pays 1100, but stopping and selling at Kensington get you 900 for it
and taking Beryllium to Planet LA makes you over 300 for driving not
as far and the little difference in the price of Boron for the return is
negligible too. A shorter run of 3 systems that pays 850 is WAY better
than going 5 systems for only 200 more. You'd be surprised how much
difference it can make. More is not always better. Quicker is really more.