New Perspectives On Asset Price Bubbles

This volume critically re-examines the profession's understanding of asset bubbles in light of the global financial crisis of 2007-09. It is well known that bubbles have occurred in the past, with the October 1929 crash as the most demonstrative example. However, the remarkably well-behaved performance of the US economy from 1945 to 2006, and, in particular during the Great Moderation period of 1984 to 2006, assured the economics profession and monetary policymakers that asset bubbles could be effectively managed with little or no real economic impact. The recent financial crisis has now triggered a debate about the emergence of a sequence of repeated bubbles in the Nasdaq market, housing market, credit market, and commodity markets. The realities of the crisis have intensified theoretical modeling, empirical methodologies, and debate on policy issues surrounding asset price bubbles and their potentially adverse economic impact if poorly managed. Taking a novel approach, the editors of this book present five classic papers that represent accepted thinking about asset bubbles prior to the financial crisis. They also include original papers challenging orthodox thinking and presenting new insights. A summary essay highlights the lessons learned and experiences gained since the crisis.

A study of asset price bubbles and the implications for preventing financial instability.

Asset price bubbles have been and continue to be an area of major public policy concern in many countries. While we know that the bursting of such bubbles is painful and destructive to the economy, little is known of their causes. This volume examines aspects of asset price bubbles from the perspective of different times and different countries.

An asset bubble relaxes collateral constraints and increases borrowing by credit-constrained agents. At the same time, as the bubble deflates when constraints start binding, it amplifies downturns. We show analytically and quantitatively that the macroprudential policy should optimally respond to building asset price bubbles non-monotonically depending on the underlying level of indebtedness. If the level of debt is moderate, policy should accommodate the bubble to reduce the incidence of a binding collateral constraint. If debt is elevated, policy should lean against the bubble more aggressively to mitigate the pecuniary externalities from a deflating bubble when constraints bind.

Why do stock and housing markets sometimes experience amazing booms followed by massive busts and why is this happening more and more frequently? Boom and Bust reveals why bubbles happen, and why some bubbles have catastrophic economic, social and political consequences, whilst others have actually benefited society.

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.

The jargon of economics and finance contains numerous colorful terms for market-asset prices at odds with any reasonable economic explanation. Examples include "bubble," "tulipmania," "chain letter," "Ponzi scheme," "panic," "crash," "herding," and "irrational exuberance." Although such a term suggests that an event is inexplicably crowd-driven, what it really means, claims Peter Garber, is that we have grasped a near-empty explanation rather than expend the effort to understand the event. In this book Garber offers market-fundamental explanations for the three most famous bubbles: the Dutch Tulipmania (1634-1637), the Mississippi Bubble (1719-1720), and the closely connected South Sea Bubble (1720). He focuses most closely on the Tulipmania because it is the event that most modern observers view as clearly crazy. Comparing the pattern of price declines for initially rare eighteenth-century bulbs to that of seventeenth-century bulbs, he concludes that the extremely high prices for rare bulbs and their rapid decline reflects normal pricing behavior. In the cases of the Mississippi and South Sea Bubbles, he describes the asset markets and financial manipulations involved in these episodes and casts them as market fundamentals.

The presence of speculative bubbles in capital markets (an important area of interest in financial history) is widely accepted across many circles. Talk of them is pervasive in the media and especially in the popular financial press. Bubbles are thought to be found primarily in the stock market, which is our main interest, although bubbles are said to occur in other markets. Bubbles go hand in hand with the notion that markets can be irrational. The academic community has a great interest in bubbles, and it has produced scholarly literature that is voluminous. For some economists, doing bubble research is like joining the vanguard of a Kuhnian paradigm shift in economic thinking. Not so fast. If bubbles did exist, they would pose a serious challenge to neoclassical finance. Bubbles would contradict the ideas that markets are rational or work in an informationally efficient manner. That’s what makes the topic of bubbles interesting. This book reviews and evaluates the academic literature as well as some popular investment books on the possible existence of speculative bubbles in the stock market. The main question is whether there is convincing empirical evidence that bubbles exist. A second question is whether the theoretical concepts that have been advanced for bubbles make them plausible. The reader will discover that I am skeptical that bubbles actually exist. But I do not think I or anyone else will ever be able to conclusively prove that there has never been a bubble. From studying the literature and from reading history, I find that many famous purported bubbles reflect inaccurate history or mistakes in analysis or simply cannot be shown to have existed. In other instances, bubbles might have existed. But in each of those cases, there are credible rational explanations. And good evidence exists for the idea that even if bubbles do exist, they are not of great importance to understanding the stock market.