Final answer:
Mass production and the assembly line had significant social and economic effects on the bourgeoisie, with the growth of cities and consumer market benefiting them, but increased competition and de-skilling of workers impacting their economic standing.
Step-by-step explanation:
Mass production and the assembly line had significant social and economic effects on the bourgeoisie, the middle-class business owners. On the social front, the bourgeoisie benefitted from the growth of cities and the expanding economy, as increased urbanization provided them with a larger consumer market for their goods. However, on the economic front, the bourgeoisie faced increased competition and the risk of falling behind due to unregulated markets. Additionally, the assembly line and mechanization of the manufacturing process resulted in the de-skilling of workers and reduced their sense of contribution to the finished product, making their jobs monotonous and repetitive.