How did Rome’s expansion affect the plebeians?

An economic term that describes happiness and its hard to measure in numbers is

Which of the following might cause the inflation rate to spike up sharply? the purchasing power of the average consumer decreases due to a sluggish economy. plentiful rainfall and moderate temperatures result in good harvests of wheat and soybeans. the items in the cpi market basket change to account for changing consumer buying habits. prices on world oil markets rise steeply due to war in the middle east.

How did ancient civilizations develope its agriculture and protect its population