How did trade encourage the development of the renaissance?

Cultural renaissance began in northern Italy, concentrated in Florence, Giotto, who gradually broke through the rigid art of the Middle Ages, making the works more vivid three-dimensional works. It then spread to the south, the impact of Rome is particularly large, and Rome is largely by the Renaissance Pope reconstruction. The Italian Renaissance reached its heyday in the late 15th century, when foreign invasions plunged the entire region into chaos. However, the idea of the Renaissance with the ideal spread to other parts of Europe, opened the Northern Renaissance and the Renaissance of England and so on.