What factors caused chinese persian and indian artisans and merchants to expand their production of textiles and porcelain export?

One of the most determining factor is demand for foreign luxury goods increased in Afro-Eurasia. Due to this demand, many of the nobilities started to collected goods from Asia because it seem exotic for the collection. Their textile also require silk which could be easily found in chinese, persia, and indian regions which contributed to an increase in demand for textiles.

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