The main way in which the guilds change business and employment practices is that workers formed semi-"unions," in which they were protected from certain abuses by employers. This also meant that business and employers had to pay them more money, since they could collectively bargain.
b, did not suffer any major wars
Agricultural has changed social classes. For, example, trash has affected the upper class because of the amount of it keeps increasing, this also increases the difference between the high and low class.