Why was reciprocity an important element of the inca empire?How did it contribute to the empire's success?

Reciprocity was a vital element of the Inca Empire because that's how they traded.

Explanation:      

The Inca civilization was a pre- Columbian Empire located in the southern part of Peru. They were known for their political, architecture, administration, and military. The Inca Empire functioned mostly without money and markets. Their economy efficiently planned where every citizen's basic needs met. Economic exchanges made using the barter system by people where they traded with each other for things they needed. The reciprocity between individuals groups, and Inca rulers helped the empire to grow powerful.

because he created electricity