Which decade was marked by the emergence of mass production and mass consumption?

The decade marked by the emergence of mass production and mass consumption is the 1920s. This period, often referred to as the "Roaring Twenties," saw significant advancements in manufacturing techniques, notably through assembly lines, which allowed for the efficient production of goods. Additionally, the rise of consumer culture, fueled by increased disposable income and credit availability, led to a surge in demand for various products, transforming lifestyles and economies.