Moving away from the developing nations. It is also time to point out that not only a developed nation, but one of the most economically powerful nations in Europe, Germany suffered an economic collapse in the 1990s that lasted nearly 6 years. Their GDP contracted by 25% during this period and also illustrates that economic collapses aren't always the short and extreme contractions that we see with nations like Japan or Argentina, sometimes they are a gradual decline in GDP.
What is most interesting is that an economic collapse doesn't always entail massive societal decay and unrest like we see in Argentina, though I am willing to go out on a limb and theorize that there was an increase in crime and some unrest, and it has a lot to do with the nature of the collapse. Is it simply a severe economic contraction? Is there hyperinflation? What other factors would contribute to making a bad situation even worse?