▁the ▁price ▁of ▁gold . ▁In ▁ 1 8 2 7 ▁the ▁pes o ▁papel ▁was ▁de valu ed ▁by ▁ 3 3 %, ▁and ▁was ▁de valu ed ▁again ▁by ▁ 6 8 % ▁in ▁ 1 8 2 9 . ▁▁ 1 8 2 9 – 1 8 7 0 ▁ ▁Juan ▁Manuel ▁de ▁Ros as ▁forced ▁Lav alle ▁to ▁leave ▁the ▁province , ▁and ▁the ▁feder als ▁ruled ▁Buenos ▁Aires ▁until ▁ 1 8 5 2 . ▁Ros as ▁modified ▁a ▁number ▁of ▁policies ▁of ▁the ▁Riv ad av ian ▁period ▁but ▁maintained ▁others : ▁he ▁set ▁a ▁custom s ▁law ▁with ▁protection ist ▁policies , ▁but ▁kept ▁the ▁port ▁under ▁the ▁exclusive ▁control ▁of ▁Buenos ▁Aires ▁and ▁refused ▁to ▁call ▁a ▁constitu ent ▁assembly . ▁ ▁The ▁custom s ▁law ▁set ▁trade ▁bar riers ▁to ▁products ▁produced ▁in ▁the ▁country , ▁and ▁im posed ▁high ▁import ▁tar iffs ▁on ▁lux ury ▁goods , ▁together ▁with ▁export ▁quot as ▁and ▁tar iffs ▁on ▁gold ▁and ▁silver . ▁However , ▁the ▁law ▁was ▁not ▁completely ▁effective ▁because ▁of ▁the ▁control ▁of ▁the ▁port , ▁which ▁did ▁not ▁allow ▁the ▁provinces ▁a ▁steady ▁financial ▁income . ▁The ▁exclusive ▁control ▁of ▁the ▁port ▁was ▁long ▁resist ed ▁by ▁feder als ▁from ▁other ▁provinces ▁and ▁led ▁to ▁the ▁conflict ▁of ▁Ros as ▁and ▁Just o ▁José ▁de ▁Ur qu iza ▁at ▁the ▁battle ▁of ▁Cas eros . ▁Despite ▁the ▁financial ▁obst acles , ▁the ▁economy ▁of ▁Entre ▁R íos ▁has ▁grew ▁to ▁a ▁size