Short answer is a person’s class, and the class they serve, is the single most important factor for the amount of power an individual is capable of gaining in society. Class in this context is how you get the money you need to live. The owning class get that money by owning businesses, land, buildings, or intellectual property. The working class gets it by working.
A lot of construction is exhausting. You stand around the hole and take turns digging. By the end of the day you’re still ready to collapse.