As long as the grain ships from Egypt arrived.
One of Vespasian's first moves on his way to becoming Emperor was to secure the grain supply in Egypt.
There were a couple of hiccups with the grain delivery in his reign I seem to recall but I am too lazy to go look them up right now.
***There were a couple of hiccups with the grain delivery***
I remember reading of an ancient letter from ROMME to shippers in Egypt about which was more important, Sand for the gladiator arenas to keep the people entertained, or grain. It went something like this...
“People are starving! There will be riots in the streets soon! Quick, SEND THE SAND!”
Rome had a bread dole, and that helped feed many thousands, definitely north of 100,000, and as high as 400,000, during the centuries of empire. Mind-boggling. Total welfare state. That was also most of the purpose of the "games". Vespasian secured Egypt and the grain supply to give him a grip the other contenders didn't have, both on the city and the army, and he easily disposed of his remaining rival during the Year of Four Emperors. It also helped that he was one of the better generals of Roman history.