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When is an IPO considered failure? 
Different stakeholders have different views of 'failure'. Maybe from Air Berlin's point of view it was a failure, but technically speaking it is not really possible to 'fail'. As long as all shares were purchased, which is a virtual guarantee since the investment banks who underwrite the IPO by and large must do to some extent, it will always be 'successful'. A decrease in value of shares immediately after IPO means that the investment bank who did the IPO for Air Berlin didn't match its IPO price with market expectations, causing shorts on the stock, and thus a decline. No failure per se.