Slaves were the cornerstone of the Roman economy, especially between 100bce and 100ce. The impact of all of the slaves from the conquest of Gaul was what Ceaser

Slaves were the cornerstone of the Roman economy, especially between 100bce and 100ce. The impact of all of the slaves from the conquest of Gaul was what Ceaser used as a platform for his politics. You are right on your second point. There was an account of a person coming up with a labour saving device for cleaning streets. However they were not allowed to use it as it was taking needed jobs away from people in the city.