The lower class become differentiated above the level of the common laborer when its most able members realized that they could use their unique skills to earn money. Those who were good with their hands could become carpenters, while those with a good ear could become musicians. Analytical types might become accountants or money lenders. All of this was possible because a densely packed population could feed itself from the output of the local farmer. Man now had the time develop his skills, because he didn’t have to look for food.
As crafts developed, some were more prized than others, so the individuals with those skills could expect to earn more money. Some crafts, by their nature, were looked down upon. For example, undertakers and butchers were considered inferior, while those engaged in intellectual pursuits were admired. To the wealthy, all skills not engaged in by them were seen as lowly, especially those where a man had to get his hands dirty.