During the middle ages, the Jews engaged in forming guilds.
The Renaissance was a rebirth of ancient Greek and Roman thinking and styles, and both the Roman and Greek civilizations were Mediterranean cultures, as is Italy. The best single reason for Italy as the birthplace of the Renaissance was the concentration of wealth, power, and intellect in the Church.
Yes it can because new ideas can make others change their mind in all different ways. It can also spark new topics and interest of ideas for others to explore. Politics is a good one because of Trump he got many people to vote for him because of the ideas he had. its just like when you parents say don't hang out with the wrong people even tho your not a person who does bad things being with them can influence you to do bad.
Craftsman farmers and slaves i think