In this world, there exists a value system of valuable and valueless.

Although he comes from a plebeian background, he achieved success through his own efforts.

This product is too cheap, it's not worth buying.

He is from a tribe in Africa.

He is studying about the uncontacted tribes in the Amazon.

All the people of this nation should be equal.

Democracy is a political system that respects the opinions of citizens.

He is very popular among netizens.

He is majoring in folkloristics at university.

Her eyes were shining with luster.