Question

The following passage is adapted from an essay on industrial history.

During the late nineteenth century, manufacturing plants relied on a centralized steam engine to power their machinery. This system required a complex network of overhead line shafts, belts, and pulleys to distribute mechanical energy throughout the factory. While functional, it was highly inefficient: if the main steam engine failed, the entire factory ground to a halt. Furthermore, the layout of the machines was strictly dictated by their proximity to the overhead shafts, resulting in cramped, poorly lit working environments and significant energy loss through friction.

The introduction of the electric motor in the late 1880s promised a revolution, but its initial implementation did little to alter factory design. Initially, managers simply replaced the central steam engine with a single, large electric motor, leaving the inefficient system of shafts and belts intact. This transitional phase, known as the "group drive" system, failed to deliver the expected productivity gains. Many industrialists concluded that electrification was an overhyped, costly endeavor.

It was not until the early twentieth century that engineers pioneered the "unit drive" system, in which each machine was equipped with its own individual electric motor. This shift was catalytic. By eliminating overhead shafts, factory designers were suddenly free to organize machines according to the logical flow of production. This spatial reorganization reduced material handling costs, improved safety, and allowed for taller, cleaner buildings with natural lighting.

To support the superiority of the unit drive system over the group drive system, historians of technology often point to productivity data from the 1910s and 1920s. During this period, US manufacturing output soared even as total energy consumption grew at a much slower rate. This divergence provides strong evidence that the main benefit of electrification lay not in the cheapness of the power itself, but in the organizational flexibility it enabled, allowing factories to be arranged for maximum operational efficiency.

In the context of the passage, the author's reference to the divergence between US manufacturing output and energy consumption in the 1910s and 1920s primarily serves to achieve which of the following goals?