What long-term economic factors led to the collapse of the Roman Empire? Trade opportunities went down, and the middle class rose significantly.
Trade opportunities went up, and the middle class shrunk significantly.
Taxes went down, and the gap between the rich and poor decreased.
Taxes went up, and the gap between the rich and poor increased.

Taxes went up, and the gap between the rich and poor increased.

Explanation:

Edge 2020

the factors that the economies of the muslim empires prosper were:

1- land trade routes-located between three continents  

2- sea trade routes

trade contributed to the spread of muslim empires, and with that islamic culture led to a growing feeling of internationalism resulted in the transfer of technology, science, and other cultural forms.

muslims have taken his goods and products to different parts of asia an indonesia. sometimes just traveled and trade, but in other occasions, stayed in the place and made a living.

trade was the key for muslims economies to prosper. their commerce routes reached far places like malaysia and java in the 11th century.

another important factor for prosperity was that muslim states served as the middle point for european traders.

they used to travel by land but sailing the seas -the indian ocean- really increase the exportation of products.