"The cause of bubbles is disputed by economists; some economists even disagree that bubbles occur at all (on the basis that asset prices frequently deviate from

"The cause of bubbles is disputed by economists; some economists even disagree that bubbles occur at all (on the basis that asset prices frequently deviate from their intrinsic value). However, bubbles are usually only identified and studied in retrospect, after a massive drop in prices occurs." https://www.investopedia.com/terms/b/bubble.asp https://www.investopedia.com/terms/b/bubble.asp