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The great depression begans in 1929,during tis period there was a worldwide economic decline triggered by a decline in demand n fall in prices.d decline led to closure of factory production which in turn meant further decline in purchasing power of people leading to decline in demand .this effect called massive unemployment n decline of real incomes of common people n govt across d world.It initially began with a stock market collapsed in US.hence great depression had caused massive unemployment n economic breakdown n two world wars in which millions died n lives of many were dislocated was caused by great depression.