“In finance, survivorship bias is the tendency for failed companies to be excluded from performance studies because they no longer exist. It often causes the results of studies to skew higher because only companies that were successful enough to survive until the end of the period are included. For example, a mutual fund company’s selection of funds today will include only those that are successful now. Many losing funds are closed and merged into other funds to hide poor performance. In theory, 70% of extant funds could truthfully claim to have performance in the first quartile of their peers, if the peer group includes funds that have closed.”
Ponera att jag släpper ut 1000 hönor i ett minfält och ställer mig och väntar på andra sidan fältet.
999 hönor sprängs och en tar sig över till andra sidan.
Nu har jag en superhöna som är min-säker 
och som jag kan sälja för dyra pengar till idio…jag menar kunder.