Economists broadly define financial asset price bubbles as episodes in which prices rise with notable rapidity and depart from historically established asset valuation multiples and relationships. Financial economists have for decades attempted to study and interpret bubbles through the prisms of rational expectations, efficient markets, equilibrium, arbitrage, and capital asset pricing models, but they have not made much if any progress toward a consistent and reliable theory that explains how and why bubbles (and crashes) evolve and are defined, measured, and compared. This book develops a new and different approach that is based on the central notion that bubbles and crashes reflect urgent short-side rationing, which means that, as such extreme conditions unfold, considerations of quantities owned or not owned begin to displace considerations of price.

Economists broadly define financial asset price bubbles as episodes in which prices rise with notable rapidity and depart from historically established asset valuation multiples and relationships. Financial economists have for decades attempted to study and interpret bubbles through the prisms of rational expectations, efficient markets, and equilibrium, arbitrage, and capital asset pricing models, but they have not made much if any progress toward a consistent and reliable theory that explains how and why bubbles (and crashes) evolve and can also be defined, measured, and compared. This book develops a new and different approach that is based on the central notion that bubbles and crashes reflect urgent short-side rationing, which means that, as such extreme conditions unfold, considerations of quantities owned or not owned begin to displace considerations of price.

One would think that economists would by now have already developed a solid grip on how financial bubbles form and how to measure and compare them. This is not the case. Despite the thousands of articles in the professional literature and the millions of times that the word "bubble" has been used in the business press, there still does not appear to be a cohesive theory or persuasive empirical approach with which to study "bubble" and "crash" conditions. This book presents what is meant to be a plausible and accessible descriptive theory and empirical approach to the analysis of such financial market conditions. It advances such a framework through application of standard econometric methods to its central idea, which is that financial bubbles reflect urgent short side rationed demand. From this basic idea, an elasticity of variance concept is developed. The notion that easy credit provides fuel for bubbles is supported. It is further shown that a behavioral risk premium can probably be measured and related to the standard equity risk premium models in a way that is consistent with conventional theory.

“An interesting take on some factors that facilitate the development and bursting of bubbles in technology industries. . . . Highly recommended.” —Choice Financial market bubbles are recurring, often painful, reminders of the costs and benefits of capitalism. While many books have studied financial manias and crises, most fail to compare times of turmoil with times of stability. In Bubbles and Crashes, Brent Goldfarb and David A. Kirsch give us new insights into the causes of speculative booms and busts. They identify a class of assets—major technological innovations—that can, but does not necessarily, produce bubbles. This methodological twist is essential: Only by comparing similar events that sometimes lead to booms and busts can we ascertain the root causes of bubbles. Using a sample of eighty-eight technologies spanning 150 years, Goldfarb and Kirsch find that four factors play a key role in these episodes: the degree of uncertainty surrounding a particular innovation; the attentive presence of novice investors; the opportunity to directly invest in companies that specialize in the technology; and whether or not a technology is a good protagonist in a narrative. Goldfarb and Kirsch consider the implications of their analysis for technology bubbles that may be in the works today, offer tools for investors to identify whether a bubble is happening, and propose policy measures that may mitigate the risks associated with future speculative episodes.

Why do stock and housing markets sometimes experience amazing booms followed by massive busts and why is this happening more and more frequently? In order to answer these questions, William Quinn and John D. Turner take us on a riveting ride through the history of financial bubbles, visiting, among other places, Paris and London in 1720, Latin America in the 1820s, Melbourne in the 1880s, New York in the 1920s, Tokyo in the 1980s, Silicon Valley in the 1990s and Shanghai in the 2000s. As they do so, they help us understand why bubbles happen, and why some have catastrophic economic, social and political consequences whilst others have actually benefited society. They reveal that bubbles start when investors and speculators react to new technology or political initiatives, showing that our ability to predict future bubbles will ultimately come down to being able to predict these sparks.

A multi-disciplinary framework through which to spot financial bubbles before they burst. Based on a popular undergraduate seminar, entitled Financial Booms & Busts, taught by the author at Yale University, Boombustology presents a multi-disciplinary framework for identifying unsustainable booms and forthcoming busts. The magnitude of our recent financial crisis mandates a firm understanding of this phenomenon before the next crisis occurs. Boombustology provides an in-depth look at several major booms and busts and offers a solid framework for thinking about future occurrences. Examines why booms and busts are not random and can therefore be identified Focuses upon various theoretical and disciplinary lenses useful in the study of booms and busts Contains a framework for thinking about and identifying forthcoming financial bubbles including several tell-tale indicators of a forthcoming bust. Illustrates the framework in action by evaluating China as a potential bubble in the making. If you want to make better decisions in today’s turbulent investment environment, understanding the dynamics of booms and busts is the best place the start. Boombustology can help you achieve this elusive goal. Vikram Mansharamani is a Lecturer at Yale University and a global equity investor.

The scientific study of complex systems has transformed a wide range of disciplines in recent years, enabling researchers in both the natural and social sciences to model and predict phenomena as diverse as earthquakes, global warming, demographic patterns, financial crises, and the failure of materials. In this book, Didier Sornette boldly applies his varied experience in these areas to propose a simple, powerful, and general theory of how, why, and when stock markets crash. Most attempts to explain market failures seek to pinpoint triggering mechanisms that occur hours, days, or weeks before the collapse. Sornette proposes a radically different view: the underlying cause can be sought months and even years before the abrupt, catastrophic event in the build-up of cooperative speculation, which often translates into an accelerating rise of the market price, otherwise known as a "bubble." Anchoring his sophisticated, step-by-step analysis in leading-edge physical and statistical modeling techniques, he unearths remarkable insights and some predictions--among them, that the "end of the growth era" will occur around 2050. Sornette probes major historical precedents, from the decades-long "tulip mania" in the Netherlands that wilted suddenly in 1637 to the South Sea Bubble that ended with the first huge market crash in England in 1720, to the Great Crash of October 1929 and Black Monday in 1987, to cite just a few. He concludes that most explanations other than cooperative self-organization fail to account for the subtle bubbles by which the markets lay the groundwork for catastrophe. Any investor or investment professional who seeks a genuine understanding of looming financial disasters should read this book. Physicists, geologists, biologists, economists, and others will welcome Why Stock Markets Crash as a highly original "scientific tale," as Sornette aptly puts it, of the exciting and sometimes fearsome--but no longer quite so unfathomable--world of stock markets.