 Mauritius's dependence on its sugar estates to sustain its economy continued into the early 20th century.The economy prospered during World War I, when supply shortages led to the rise in the market price of sugar.The eventual fall in the price of sugar in the 1930s due to the Depression, the mono-crop agricultural industry and the abolition of the indentured labor system have made the Mauritian economy vulnerable, which culminated in labour unrests in 1937.