Originally Posted by
North Southland
Econ has 6 science types, but you don't put as many books in it as with the other categories. Income and wage reduction, for example, both affect kind of the same thing, so sometimes books are better spent on the latter (and people don't put as many books on wages, anyway), while production is very important to some builds (mages and clerics, for example) and not so much for others (undeads?).
And yes, of course, the other two types of science are also important to specific builds. But you can allocate scientists in that case, whereas everybody needs economy.