Answer:
Rome's economy grew larger due to the conquest of new lands.
Step-by-step explanation:
While Roman was a city-state, it was a highly sophisticated place that was able to use limited resources to fight wars and take over new land.
They began by conquering nearby city states and consolidating their power, before embarking on more ambitious skirmishes in North Africa and Europe.
As the Roman Empire grew, they were able to acquire more land for agriculture, develop a single language, law and currency which all helped to enhance trade and business and generate more tax revenue.
Within a couple of generations, Roman had become more wealthy as millions of new people were living under the government.