* Slavery is morally wrong. Slavery is a system of involuntary servitude in which one person is owned by another person. This means that the slave has no rights and can be treated as the owner sees fit. Slavery is inherently exploitative and degrading, and it is a violation of basic human rights.
* Slavery is economically inefficient. Although slave labour can save money through not paying wages, it was less efficient than free labour in ancient Rome. Slaves have no incentive to work hard, and they often need to be supervised to ensure they are doing their jobs correctly. This supervision costs time and money, and it reduces the overall efficiency of the economy.
* Slavery is socially harmful. Slavery creates a society based on inequality and injustice. Slaves are often treated as second-class citizens and denied basic rights and opportunities. This can lead to social unrest and conflict, as well as a lack of trust and cooperation between people.
In the Roman world, there was a growing recognition of the moral, economic, and social problems of slavery. This led to a number of reforms that improved the lives of slaves, and eventually to the abolition of slavery in the Roman Empire.
For example, in the first century AD, the emperor Claudius issued an edict that forbade the killing of slaves without a trial. In the second century AD, the emperor Hadrian banned the branding of slaves. And in the fourth century AD, the emperor Constantine made it illegal to sell children into slavery.
These reforms were a step in the right direction, but they did not end slavery in the Roman Empire. It took several more centuries for slavery to be finally abolished.