How did the growth of trade, commerce, and city-states create a boom in art and learning during the renaissance?

Basically as the banking system was in its nascent stages in Italian cities, such as Florence, there was the rise of a centralized wealthy urban class. Certain families such as the Medici rose to the fore. Their wealth dictated the frescoes and artworks in many parts of the cities in which they resided. They often competed to commission works of artists and underwrite the lives of such folk.

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