What is the optimal teching distribution? General rule of thumbs or more mathematical analysis would work. My general rule is always to tech/sell the most expensive tech currently sold (unless the difference between different tech prices is less than $200) on the market. So if I were playing techer, I would be teching mostly Indy in Primary. I would also spend a few turn to tech some bus/res/mil/weapon, which won't be sold.

if you are techer then busi, resi, agri, indy and military (and sdi and warf might sell nicely) sell well on individual servers and on alliance-servers all techs (except medi and spy which have their peaks but otherwise are mediocre sellers) sell well unless you have priced your goods at too high.

depending what strats are played like if server is mostly cashers then agri won't have that high demand and vice versa.