AP® United States History · Unit 7 · Topic 7.7
Cars, Radio, and the Consumer Economy
Henry Ford's moving assembly line made cars cheap enough for ordinary families, and installment credit let them buy cars, radios, and appliances before saving the cash, together building the 1920s consumer economy.
Henry Ford did not invent the car, he invented a way to make it cheap. On his moving assembly line, the chassis moved past stationary workers, each one repeating a single task: bolt on a wheel, attach a headlamp, tighten a bolt. Workers no longer walked to the car; the car came to them. That cut the time to build a Model T from over twelve hours to about ninety minutes. Ford passed the savings into price cuts year after year, and the Model T fell from around 850 dollars in 1908 to under 300 dollars by the mid-1920s, even as Ford kept profits high through sheer volume. A car that once marked a family as wealthy became something a factory foreman could afford.
Price alone does not explain 23 million cars on the road by 1929, up from about 8 million in 1920. Installment credit closes the gap. Instead of saving for years, a buyer put down a fraction of the price and paid the rest in monthly installments, driving the car home the same day the money was still mostly unearned. The same logic sold radios and refrigerators. This pulled spending forward in time and tied household budgets to future paychecks, a fragile arrangement that would snap when incomes collapsed after 1929.
The car's effects reached past the factory gate. Cheap, reliable transportation let families live miles from where they worked, seeding the first suburbs and demanding paved highways, gas stations, and motels. Sunday became a day for driving trips rather than staying on the block. Radio, bought on the same credit terms, knit these scattered households into a shared national culture of advertising, news, and entertainment, setting up the mass consumer society that the Depression would then test.
Key terms
- Moving assembly line
- A production method where the product moves past workers who each perform one repeated task, speeding output and cutting cost.
- Installment credit
- A payment plan letting buyers take a good home after a down payment, paying the remaining cost in scheduled monthly amounts.
- Consumer economy
- An economic system driven by household spending on mass-produced goods like cars, radios, and appliances rather than by savings or production alone.
- Model T
- Ford's mass-produced automobile, whose falling price through the 1920s made car ownership possible for middle-class families.
Watch it explained
- How it worksWalk me through a moving assembly line and how it drops the Model T's price year by year.
- Worked exampleShow me American car ownership climbing from about 8 million in 1920 to 23 million by 1929.
- How it worksHow does buying on installment credit put goods in homes before the money exists?
- Ties togetherHow does the car reshape the suburb, the highway and the American Sunday all at once?
Check yourself
End of topic.