What discovery had a great impact on economic activity in the islamic empire?

Explanation:

The transition to paper by the medieval era. papermaking began in china but it was not active that is it was not used for economic purposes until when Muslims adopted the technology.it made the Muslims economy to grow vigorously creating systems of exchange, credit and long-distance communication between the buyers and the sellers.

the answer should be monarchy

which empire had the greatest influence on the history and cultural development of russia?