don't worry so much

$Alibaba (BABA.US)$ theoretically, a company that buy back 5 billion worth of shares every quarter will only see a drop in value when there is a sale of more 5 billion worth of shares into the market. but how many 5 billion worth of shares can be sold into the market every quarter? it is just a matter of time this counter will behave like apple when apple initially started its share buyback many years ago.