Final answer:
The most significant economic change in the past 100 years is the transition from agrarian to industrial and information-based economies, resulting in modern economic growth and significant technological advancements.
Step-by-step explanation:
According to the text, the most significant economic change in the past 100 years may be the shift from agrarian societies to industrial and information-based economies. This transformation is a part of what is commonly referred to as the period of modern economic growth. Richard Easterlin, an economist at the University of Southern California, highlighted the striking changes in human conditions due to economic growth over the last two centuries. This growth has not only increased the real production of goods and services but also introduced improvements in product quality and the invention of new products.
The United States' economic landscape serves as an example, having expanded its real production of goods and services nearly fourfold since 1960. Furthermore, technological innovations during the Industrial Revolution have drastically altered everyday life, resulting in an acceleration of life's many aspects.