What are the three estates in the modern world?

The church, the upper class, and the lower class.

It's more of how you perceive them to be though.

The original Three Estates, as you may already know, are the church, the nobility, and the peasants. So if you were to translate that to today, the nobility would be those wealthiest in our society, and the peasants are those who are the lowest on the totem pole. The lower working class.

Hope this helps!