Deflation is a decline in general price levels, often caused by a reduction in the supply of money or credit. Deflation can also be brought about by direct contractions in spending, either in the form of a reduction in government spending, personal spending or investment spending. Deflation has often had the side effect of increasing unemployment in an economy, since the process often leads to a lower level of demand in the economy.
Stagflation is a condition of slow economic growth and relatively high unemployment - a time of stagnation - accompanied by a rise in prices, or inflation. Stagflation occurs when the economy isn't growing but prices are, which is not a good situation for a country to be in. This happened to a great extent during the 1970s, when world oil prices rose dramatically, fueling sharp inflation in developed countries. For these countries, including the U.S., stagnation increased the inflationary effects.
Hyperinflation is unusually rapid inflation. In extreme cases, this can lead to the breakdown of a nation's monetary system. One of the most notable examples of hyperinflation occurred in Germany in 1923, when prices rose 2,500% in one month!
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