Managing Bubbles in Experimental Asset Markets with Monetary Policy

We study the effect of a “leaning against the wind” monetary policy on asset price bubbles in a learning-to-forecast experiment, where prices are driven by the expectations of market participants. We find that a strong interest rate response is successful in preventing or deflating large price bubbles, while a weak response is not. Giving information about the interest rate changes and communicating the goal of the policy increases coordination of expectations and has a stabilizing effect. When the steady-state fundamental price is unknown and the interest rate rule is based on a proxy instead, the policy is less effective.     

资产价格泡沫与我国货币政策传导效应的非对称性研究

本文通过构造含有资产价格泡沫的经济系统,使用结构向量自回归模型与脉冲响应函数分析了我国货币政策对资产泡沫的影响和资产价格泡沫与其它变量之间的关系。结果表明,我国货币政策的资产价格传导渠道效应显著存在,但货币政策的资产价格效应对于不同资产类型具有非对称性,货币政策对股票市场的影响要远远大于对房地产市场的影响;资产价格泡沫的正向冲击对通货膨胀呈现出倒U型影响,并且不同资产类型对通货膨胀具有非对称性,股票市场对通货膨胀的影响要远远大于房地产市场;资产价格泡沫对产出具有正向效应,但不同资产价格类型对于产出冲击也存在非对称性,股票资产价格对产出的影响要小于房地产对产出的影响。     

融券对我国股票价格的影响

本文通过测量我国股票价格在实行融券前后的显著变化,并比较回报率横截面分布特征的变化来检验两种理论假说:1)融券使股价降低;2)投资者意见分歧加大会导致股价更大程度下跌。研究结果支持这些假说,并表明我国股市投资者预期到了融券对股价的负面影响,股价在融券宣告日前后就开始向下调整。对融券余量数据的分析显示,融券活动在起初并不活跃,导致股价在此期间下跌的主要原因是市场对融券预期的负面信息效应。     

Partial Revelation of Information in Experimental Asset Markets

We develop a model of market efficiency assuming private information is partially revealed to uninformed traders via the behavior of those who are informed. This partial revelation of information (PRE) model is tested in fourteen computerized double auction laboratory markets. It explains the market value and allocation of purchased information, and asset allocations, better than either a fully revealing information model (FRE strong-form efficiency) or a nonrevealing expectations model; but it takes second place to FRE in explaining asset prices. We conjecture that refined versions of PRE may provide insight into “technical analysis” and minibubbles in securities markets.     

卖空制度对企业融资的影响研究——基于融券卖空制度的检验

基于中国2010年实施融资融券制度的背景,利用分批扩容的准自然实验环境,检验卖空制度对企业融资的影响。结果发现：卖空制度的引入对企业外源融资能够起到抑制作用,这来源于外部治理作用所带来的过度融资的减少、市场信息反馈效应所带来的企业融资——股票价格敏感度的提升,以及融资成本的提高。进一步分析发现,企业外源融资的减少是有效率的,能够提高企业资源配置效率,促进资本结构动态调整。因此,卖空制度有助于抑制企业的过度融资,提高企业资源配置效率,对资本市场的稳定运转和完善大有裨益。     

杠杆对资产价格泡沫的非对称效应研究

已有系列金融危机表明,虽然适度的杠杆有利于促进经济发展,但杠杆过度往往引起资产价格泡沫,诱发系统性风险,对金融部门和实体经济产生负面冲击。本文建立了基于杠杆的资产价格泡沫模型,揭示了杠杆和资产价格泡沫的内在逻辑关系,以股价泡沫和房价泡沫代表资产价格泡沫,运用分位数方法,从宏观杠杆、金融部门杠杆、非金融部门杠杆和政府部门杠杆四个维度深入研究了杠杆对资产价格泡沫影响的非线性性和非对称效应,发现不同杠杆对资产价格泡沫的影响在大小和方向上随着经济发展阶段、泡沫演化程度和杠杆水平的变化而变化,相同水平的杠杆在泡沫不同阶段对资产价格泡沫的影响亦不相同。因此,相关监管部门需要结合杠杆对资产价格泡沫的影响机制,区分泡沫程度,优化杠杆结构,维持合理杠杆水平,避免资产价格泡沫引发系统性金融风险。     

Immediate Disclosure or Secrecy? The Release of Information in Experimental Asset Markets

This paper reports the results of experimental asset markets designed to investigate how the public disclosure of uncertain information affects market and individual outcomes. In some markets, no information is released as trading starts, and in others, an imperfect pre‐announcement is disclosed. The reliability of the pre‐announcement varies across markets. Our data indicate under‐reaction to a pre‐announcement that is highly reliable and over‐reaction to one with much lower reliability. Price volatility is higher and allocational efficiency is lower with a pre‐announcement that reflects substantial uncertainty. Furthermore, when the reliability of the pre‐announcement is low, traders extract a smaller proportion of the total attainable profit. Thus, in a highly uncertain environment better outcomes may result when information is withheld. These results have important policy implications regarding the disclosure of information by the Federal Reserve. In a highly uncertain environment, better outcomes may actually result with less information.     

Short Selling and the Weekend Effect in Nasdaq Stock Returns

We examine daily short selling of Nasdaq stocks to explore whether speculative short selling causes a significant portion of the weekend effect in returns. We identify a weekend effect in speculative short selling whereby it constitutes a larger percentage of trading volume on Mondays versus Fridays. We find an opposite effect in dealer short selling, consistent with market makers adding liquidity and stability. Our main finding is that speculative short selling does not explain an economically meaningful portion of the weekend effect in returns, even among the firms most that are most actively shorted. This finding contradicts some prior studies.     

卖空机制的审计收费效应研究

卖空机制作为一种金融创新,如何在提高证券市场定价效率的同时,有效发挥外 部治理功能、改善公司治理、间接推动国内资本市场健康发展成为理论和实践中的一项重要 课题。运用多元回归模型对国内卖空机制改变审计风险、进而影响审计收费行为的实证检验表 明,随着股票卖空比率的上升,公司审计收费也相应增加。而股票卖空比率与公司审计费用受 制度环境影响显著,在市场化水平较高的地区,公司审计面临来自投资者更大的压力。此外, 公司审计收费与股票卖空比率的正相关关系会因卖空机制的存在变得更加显著。     

Short Selling and the Weekend Effect for NYSE Securities

Using short-sale transactions data, we examine the relation between short selling and the weekend effect. We do not find that short selling is more abundant on Monday than on Friday, even for stocks that have higher Friday returns. We find that short sellers execute more short-sale volume during the middle of the week, and that the positive correlation between short selling and returns on Monday is greater, on average, than the correlation on the other days of the week. Our results are robust to subsamples of stocks with larger weekend effects and stocks that do not have listed options.     

Asset Bubbles and the Cost of Economic Fluctuations

Lucas (1987, 2003) estimates that the cost of economic fluctuations is low; a social planner would pay no more than 0.1% of (permanent) consumption to eliminate all future business cycle fluctuations. The current paper extends Lucas’ calculations by studying the costs of fluctuations arising from asset bubbles. We estimate two classes of costs: consumption volatility due to asset bubbles in a representative agent economy and consumption volatility that arises because households have heterogeneous exposure to the bubble assets. We show that the magnitude of welfare costs is primarily driven by the existence of heterogeneity. Our benchmark calibration implies that the asset bubbles of the last decade generated a social welfare cost equal to a permanent 3% reduction in the level of national consumption. If assets are held proportionately across the population, these welfare costs fall by an order of magnitude. Our calculations are sensitive to the details of the calibration, including the degree of balance sheet and trading heterogeneity, the coefficient of relative risk aversion, and the magnitude of the asset bubble. Our preferred specifications generate welfare costs ranging from 1% to 10% of (permanent) national consumption.     

人民币境外衍生市场与境内即期市场间的信息流动关系研究

本文基于Granger因果检验和GARCH模型从线性报酬溢出效应和非线性波动率溢出效应两个角度实证研究了人民币境外衍生市场与境内即期市场间的信息流动关系.研究结果表明:在报酬溢出方面,境外CME期货市场与境内即期市场之间存在双向影响关系,但境外NDF远期市场对境内即期市场仅存在单向的影响关系;在波动率溢出方面,境外CME期货市场和境外NDF远期市场都对境内即期市场存在波动率溢出效应,而境内即期市场对境外CME期货市场存在波动率溢出效应,但对境外NDF远期市场的波动率溢出效应不显著.     

Interaction Between Short Selling and Potential Insider Selling in the IPO Aftermarket

We document the determinants of short interest in newly public firms during the lockup period and how short interest influences the valuation effects surrounding lockup expiration. We find that the short interest is larger for stocks that have more downward price potential at lockup expiration. We also find that the stocks that are subjected to larger short positions experience more pronounced negative valuation effects upon lockup expiration. Finally, we find that the stocks with a larger short interest position just after lockup expiration experience weaker returns during the following the six-month period.     

The Asset Growth Effect and Investor Protection in Emerging Markets: The Role of the Global Financial Crisis

The previous evidence shows that firms experience lower returns after a period with higher growth in assets. Two alternative explanations have been raised to explain this effect: mispricing and optimal investment. This study examines this effect in 26 emerging markets over the period of 2005–2013 with a special attention to the recent global financial crisis. We find a stronger asset growth effect during the crisis years relative to other years. This effect is stronger in firms with small or medium stock turnover ratio and firms operating in industries with low R&D intensity. We also investigate the heterogeneity across countries and find that a stronger asset growth effect during the crisis years exists only for emerging markets with low protection of shareholders and creditors. We argue that this evidence is in line with the mispricing hypothesis.     

Short Selling and Index Arbitrage Profitability: Evidence from the SGX MSCI and TAIFEX Taiwan Index Futures Markets

There are numerous impediments to market efficiency and index arbitrage in real capital markets, including the uptick rule on short selling, execution risk, market impact costs, regulatory barriers, and capital constraints. Adopting and relaxing the uptick restriction in the Taiwan stock market facilitated a study on whether adjustments in this restriction influence the efficiency and arbitrage of the Singapore Exchange Limited (SGX) and the Taiwan Futures Exchange (TAIFEX) index futures markets. This study examines the above issues using five-minute intraday transaction data and performs an ex post test of arbitrage, ex ante test of arbitrage, and regression analysis. Empirical results indicate that relaxing the uptick rule should improve market efficiency and facilitate long arbitrage, subsequently accelerating the adjustment to no-arbitrage bounds and helping to decrease ex post and ex ante mispricing and underpricing following the relaxation.     

Beauty Contests and Iterated Expectations in Asset Markets

In a financial market where traders are risk averse and shortlived and prices are noisy, asset prices today depend on theaverage expectation today of tomorrow’s price. Thus (iteratingthis relationship) the date 1 price equals the date 1 averageexpectation of the date 2 average expectation of the date 3price. This will not, in general, equal the date 1 average expectationof the date 3 price. We show how this failure of the law ofiterated expectations for average belief can help understandthe role of higher-order beliefs in a fully rational asset pricingmodel.     

A Test of the Modigliani‐Miller Invariance Theorem and Arbitrage in Experimental Asset Markets

Modigliani and Miller show that the total market value of a firm is unaffected by a repackaging of asset return streams to equity and debt if pricing is arbitrage‐free. We investigate this invariance theorem in experimental asset markets, finding value‐invariance for assets of identical risks when returns are perfectly correlated. However, exploiting price discrepancies has risk when returns have the same expected value but are uncorrelated, in which case the law of one price is violated. Discrepancies shrink in consecutive markets, but persist even with experienced traders. In markets where overall trader acuity is high, assets trade closer to parity.     

The Effect of Sequential Information Arrival on Asset Prices: An Experimental Study

A complete understanding of security markets requires a simultaneous explanation of price behavior, trading volume, portfolio composition (ie., asset allocation), and bid-ask spreads. In this paper, these variables are observed in a controlled setting—a computerized double auction market, similar to NASDAQ. Our laboratory allows experimental control of information arrival—whether simultaneously or sequentially received, and whether homogeneous or heterogeneous. We compare the price, volume, and share allocations of three market equilibrium models: telepathic rational expectations, which assumes that traders can read each others minds (strong-form market efficiency); ordinary rational expectations, which assumes traders can use (some) market price information, (a type of semi-strong form efficiency); and private information, where traders use no market information. We conclude 1) that stronger-form market models predict equilibrium prices better than weaker-form models, 2) that there were fewer misallocation forecasts in simultaneous information arrival (SIM) environments, 3) that trading volume was significantly higher in SIM environments, 4) and that bid-ask spreads widen significantly when traders are exposed to price uncertainty resulting from information heterogeneity.     

Generalised Sharpe Ratios and Asset Pricing in Incomplete Markets

The paper presents an incomplete market pricingmethodology generating asset pricebounds conditional on the absence of attractiveinvestment opportunities in equilibrium.The paper extends and generalises the seminal article ofCochrane and Saá-Requejowho pioneered option pricing based on the absenceof arbitrage and high Sharpe Ratios. Ourcontribution is threefold:We base the equilibrium restrictions on an arbitrary utility function, obtaining theCochrane and Saá-Requejo analysis as a special case with truncated quadratic utility. We extend the definition of Sharpe Ratio from quadratic utility to the entire family of CRRA utility functions and restate the equilibrium restrictions in terms ofGeneralised Sharpe Ratios which, unlike the standard Sharpe Ratio, provide aconsistent ranking of investment opportunities even when asset returns are highlynon-normal. Last but not least, we demonstrate that for Itô processes theCochrane and Saá-Requejo price bounds are invariant to the choice of the utilityfunction, and that in the limit they tend to a unique price determined by theminimal martingale measure.     

Are the Liquidity and Collateral Roles of Asset Bubbles Different?

Several papers explain why asset bubbles are observed when growth is large. These papers differ in the role of the bubble, used to provide liquidities or as collateral in a borrowing constraint. We compare the liquidity and collateral roles of bubbles in an overlapping generations model. When the bubble is deterministic, the equilibrium is identical under these two roles, implying that the same mechanism explains the crowding-in effect of the bubble on growth. With stochastic bubbles, growth is larger when bubbles play the liquidity role, because the burst of a bubble used for liquidity is less damaging to capital investors.