What of the following factors contributed to American consumer spreading during the 1920's?

Several factors contributed to the spread of American consumerism during the 1920s, including the rise of mass production techniques, which made goods more affordable and accessible. The expansion of credit systems allowed consumers to purchase items on installment plans, encouraging spending. Additionally, the advent of advertising and marketing created a culture of desire for new products, while increased urbanization and leisure time also fueled consumer interest in a variety of goods.