Using a simple model of equity valuation, we de fine stock market bubbles and anti-bubbles as periods in which the dynamics of valuation is temporarily explosive. We identify a mechanism for the creation and destruction of bubbles and anti-bubbles that depends on the interaction between...

The 2017 bubble on the cryptocurrency market recalls our memory in the dot-com bubble, during which hard-to-measure fundamentals and investors' illusion for brand new technologies led to overvalued prices. Benefiting from the massive increase in the volume of messages published on social media...

The events surrounding the stock-price peak of March 2000 are commonly interpreted as the bursting of a technology or Internet bubble, with some researchers pointing out that the pattern could also arise in fundamental models. We inform the debate by studying the long-run performance of Internet...

In a dynamic trading model, investors with heterogeneous beliefs have an option to sell the stock now and buy it back later. Due to this repurchase option and the risk aversion of investors, it is possible for the stock price to be lower than the lowest valuation among investors even when the...

We combine both a mathematical analysis of financial bubbles and a statistical procedure for determining when a given stock is in a bubble, with an analysis of a large data set, in order to compute the empirical distribution of the lifetime of financial bubbles. We find that it follows a...

Asset price bubbles have fascinated economists for decades. In consequence, the literature on bubbles and their detection is abundant, with many researchers taking very opposite positions on the topic, however. This survey gives a structured overview of the two branches of research that have...

We develop a model in which investors have heterogeneous beliefs about both the mean and the risk of future signals and the final stock payoff. As investors who perceive the lowest risk vary across different periods, the overall perception of the market risk is reduced in an economy with dynamic...

One of the most popular investment anecdotes relates how Isaac Newton, after cashing in some large early gains, staked his fortune on the success of the South Sea Company of 1720 and lost heavily in the ensuing crash. However, this tale is based on only a few scraps of hard evidence, some of...

This paper analyzes the presence of a speculative component during the extra ordinary upsurge in Karachi Stock Exchange. We implement cointegration tests, between 1997 and 2008, on price and dividends of various market and sectoral indices. The no bubble hypothesis could not be rejected for...

We apply the Phillips et al. (2015) methodology to date-stamp bubbles in Ethereum. The analysis of the drivers of fundamental value suggests that the explosive behavior documented in ether prices does not constitute speculative bubbles, but reflects the abrupt rally of demand for the use of...