The aim of this paper is to present novel tests for the early causal diagnostic of positive and negative bubbles in the … LPPLS (log-periodic power law singularity) approach successfully diagnoses positive and negative bubbles, constructs … efficient End-of-Bubble signals for all of the well-documented bubbles, and obtains for the first time new statistical evidence …

recognised initially in bull market or from the M&A without founder-chairman or founder-CEO contains more bubbles and tends to be … lower quality. The more the bubbles, the larger the optimism or the errors of analysts’ forecasts. In order to exclude the …