what is yo yo 
 yo yo is a slang term for a very volatile market the name comes from the movements of a yo yo toy in a yo yo market security prices continually go up and down a yo yo market has no distinguishing features of either an up or down market rather it exhibits characteristics of both security prices in a yo yo market may swing from very high to reach a low point over a given period of time making it difficult for buy and hold investors to profit understanding a yo yo marketwhile it is difficult for buy and hold investors to profit in a yo yo market they can be profitable environments for astute traders who are able to recognize buy and sell points and make trades before the market reverses these markets are characterized by steep up and down movements in share prices which can occur within a short timeframe such as weeks days or even hours the movements are often abrupt and they usually involve a majority of the stocks moving in unison traders on wall street also refer to this kind of share price activity as all or nothing implying that everything about the market is either good or bad 2015 as an example of a yo yo marketthe occurrence of yo yo markets is rare especially those that last for several days or more they are more likely to occur when market volatility picks up following a protracted rise in stock prices which can tend to make investors nervous for example during the first six months of 2015 the dow jones industrial average djia never fluctuated up or down more than 3 5 as it rose to record heights then in august a convergence of issues china s slowing economy crashing oil prices and the prospect of higher interest rates sent the stock market in a steep decline from aug 20 2015 to sept 1 2015 the market experienced eight trading days in which the standard poor s 500 index advance decline reading was either above 400 or below 400 400 of the 500 stocks in the index were either advancing or declining at the same time within just two days the djia had its worst and best days of the year prior to aug 20 there had been only 13 days when that occurred 1 the previous time the market had experienced an extended number of yo yo days was during the stock market crash of 2008 during a 15 day period from aug 20 2008 to sept 9 2008 there were 11 occurrences 