Answer:
because most of the technology in China is more advanced than the rest
Athens is located in Greece, and Greece is a country that has a Mediterranean climate. The Mediterranean climate, as well as the soil type in Greece, is a natural place for the growth of olive trees and wine trees that produce fruits of high quality. Athens used this, and by making products from both of these trees, olive oil from the olive trees, and wine from the wine trees, they were making a lot of wealth because of this products were in high demand and not many places had the conditions for growing these trees and making products from them. Also Athens was very active in the sea trade and had contacts all over the Mediterranean, and that just opened up a larger market for their products.
Florence enjoyed a flourishing of the arts in the 1400s. Many artists moved to Florence because there was a market for the purchase of their artwork. The upper and middle class of merchants and bankers were very wealthy and they wanted to enjoy the pleasures of life on earth, not just focus on the afterlife. This created a gap in the market for quality artworks and music concerts etc. Artists, musicians and poets moved to Florence to fill this gap in the market.
