I know that it's counted to determine your rating along with military and industrial scores, and that having it under 0 makes you isolated diplomatically. Probably, 100 is also good for the extra 0.5 diplomats. But other than that, it seems to me that the lower your prestige the better.
Since higher prestige countries - and their pops - get first dibs on world market goods, it seems to me that you'd want to be last, so that your capitalists invest their money instead of spending it.
Since higher prestige countries - and their pops - get first dibs on world market goods, it seems to me that you'd want to be last, so that your capitalists invest their money instead of spending it.