Chris Jarvis, a Senior Economist at the IMF wrote a paper on The Rise and Fall of the Pyramid Schemes in Albania in 2000.
The paper includes descriptions of what happened in Albania in 1996, when some institutions started offering high interest return on investments and kept raising the interest rates until the whole thing collapsed and the people who had been too gullible lost all their investments.
If anybody is interested, I could go over some of the highlights of the paper, particular the similarities with Haïti's Coopératives.