Final answer:
The uneven distribution of income prior to the Great Depression led to a lack of consumer purchasing power, limited economic participation of the majority, and a ripple effect of defaults after the stock market crash, which together contributed significantly to the economic downturn.
Step-by-step explanation:
The uneven distribution of income during the late 1920s contributed significantly to the onset of the Great Depression. With stagnant wages and a wide wealth gap, the majority of American families, about 80 percent, had little to no savings which affected consumer purchasing power.
The affluent minority had most of the wealth but were insufficient to sustain market demand as buyers. The stock market, dependent on a continuous flow of new buyers and sellers, suffered greatly when there were no new investors to maintain its momentum, leading to market crashes and widespread bank failures.
As the economy slowed, businesses began to lay off workers en masse, resulting in high unemployment and increased pressure on already-strained relief efforts. In rural areas, farmers faired poorly due to crop price collapses and severe droughts, making it impossible for them to maintain their livelihoods or pay mortgages, leading to foreclosures and even greater economic hardship.
The purchasing of goods on credit further complicated the economic predicament. With the job losses that the Depression brought on, many households defaulted on credit payments, causing a ripple effect that forced stores to cut jobs to remain operational. This cycle of overproduction and underconsumption created by the unequal wealth distribution and a lack of consumer spending power ultimately ground the national economy to a halt.