The consumers demand goods affected the Italian city-states because they expanded greatly and grew also in power. Northern and Central Italy became more prosperous than the South because of the trade routes. Spices, dyes, silks were imported to Italy and then resold throughout Europe.
Later modern commercial infrastructure developed like bookkeeping, joint stock companies, banking systems, systematized exchange markets, insurances, and others.
As a result, the population rose, huge cities were developed such as Venice, Florence, and Milan. Also, the Church became more powerful, because of the great amount of money. This way, cathedrals were rebuilt, and rich people like merchants would give more money to the Church.