Often in our little discussions we use some symbols related to stocks. YoY (or yoy) means Year on Year. It compares a certain comany perforamance figure between this year and the previous year. Example:If we look at EBAY's key statistics on yahoo finance , which is our main source of company performance data, we will find:
Qtrly Revenue Growth (yoy):34.80% meaning that during the most recent quarter available for this year ( first quarter 2006) Ebay's Revenue grew 34.80% compared to the corresponding quarter of last year ( first quarter 2005)
We will also (unfortunately for me and for some other proletarian investors) notice that:
Qtrly Earnings Growth (yoy):-3.10% meaning that during the most recent quarter available for this year ( first quarter 2006) Ebay's earnings fell 3.10% compared to the corresponding quarter of last year ( first quarter 2005).
This lets us understand two concepts:
1) what does yoy mean
2) why my unlucky EBAY stock went down so fast lately!
BUY, SELL, KEEP 
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