How did the pax romana economic growth in the empire?

The Pax Romana helped economic growth in the empire because it was the time of peace and no one was present as powerful as the Romans during that time. It was during the time of reign of the King Julius Caesar. It actually began in 28 BC and ended in 180 AD. As no other power could ever defeat Rome during this period, so Roman empire flourished in regards to economic prosperity. 

The statistics for the eastern war are grim. more than three-million men died in the fighting, more than nine-million men were wounded, and every major country which participated lost its form of government.