I'm curious to what degree Rome of the late republic was fed by imports as opposed to local goods. (Rome in this case meaning the city and the Italian peninsula, as opposed to her client states and various holdings.) I've read several times that Egypt was "the breadbasket" of the Roman republic, but I've also heard that the Romans exported cereals to the greater mediterranean.
So could the people of the Italian peninsula support themselves agriculturally, or was the population reliant on plunder, tribute, and foreign trade? If so, what were the major sources of Roman food imports? Thanks for your time.