Quote: "The Great Depression (1929–1939) was an economic shock that affected most countries across the world."
A severe economic downturn that began in 1929 and lasted throughout much of the Interwar period.
Quote: "The economic contagion began around September 1929."
Quote: "The economic contagion began around September 1929 and led to the Wall Street stock market crash of October 24 (Black Thursday)."
Quote: "Between 1929 and 1932, worldwide gross domestic product (GDP) fell by an estimated 15%. By comparison, worldwide GDP fell by less than 1% from 2008 to 2009 during the Great Recession."
Quote: "However, in many countries, the negative effects of the Great Depression lasted until the beginning of World War II."
Quote: "Devastating effects were seen in both rich and poor countries with falling personal income, prices, tax revenues, and profits."
Quote: "International trade fell by more than 50%."
Quote: "Unemployment in the U.S. rose to 23%."
Quote: "Cities around the world were hit hard, especially those dependent on heavy industry. Construction was virtually halted in many countries. Farming communities and rural areas suffered as crop prices fell by about 60%."
Quote: "Economic historians usually consider the catalyst of the Great Depression to be the sudden devastating collapse of U.S. stock market prices, starting on October 24, 1929."
Quote: "However, some dispute this conclusion, seeing the stock crash less as a cause of the Depression and more as a symptom of the rising nervousness of investors."
Quote: "Gradual price declines caused by falling sales of consumer goods (as a result of overproduction because of new production techniques, falling exports and income inequality, among other factors) that had already been underway." Please note that while the paragraph provided is extensive, it does not have enough distinct information to formulate twenty unique study questions with corresponding quotes.