金融分权对地方政府土地资本化形式选择影响研究

研究目的：剖析金融分权对地方政府土地资本化形式选择的影响机理。研究方法：联立方程模型。研究结果：（1）影响机理为：金融分权通过为相关行业和部门提供融资便利，影响地方政府对土地资本化形式的选择。（2）时间特征为：整体时段，金融分权主要促使地方政府选择土地金融；2012年之后，金融分权促使地方政府选择商住用地生租。（3）空间特征为：东部地区，金融分权促使地方政府选择商住用地生租，中西部地区金融分权则促使了地方政府选择土地金融。研究结论：金融分权不但是地方政府选择土地金融的关键影响因素，还是地方政府选择商住用地生租的重要推手，鉴于此，金融分权亦可被视为土地资本化的重要成因之一。     

Neighborhood effects,college education,and social mobility

This study models the impact of environmental factors on upward social mobility, where the educational environment is measured by the proportion of college-educated individuals, and social mobility is measured by a change in proportion of people in different income classes. The dynamics of the educational environment is modeled using a modified version of the invasion/extinction ecological model of Richard Levins. The educational environment influences the educational choices of poor people, becoming effective only after a threshold point is reached. The rate of growth in influence is modeled using a monotonically increasing saturation function, which includes a delay parameter referred to as handling time, that measures the speed of influence. Our simulations indicate that poor people choose to become educated at a rate that primarily depends on the density of the local environment.     

Epstein-Zin utility maximization on a random horizon

This paper solves the consumption-investment problem under Epstein-Zin preferences on a random horizon. In an incomplete market, we take the random horizon to be a stopping time adapted to the market filtration, generated by all observable, but not necessarily tradable, state processes. Contrary to prior studies, we do not impose any fixed upper bound for the random horizon, allowing for truly unbounded ones. Focusing on the empirically relevant case where the risk aversion and the elasticity of intertemporal substitution are both larger than one, we characterize the optimal consumption and investment strategies using backward stochastic differential equations with superlinear growth on unbounded random horizons. This characterization, compared with the classical fixed-horizon result, involves an additional stochastic process that serves to capture the randomness of the horizon. As demonstrated in two concrete examples, changing from a fixed horizon to a random one drastically alters the optimal strategies.     

Proxy contests and debt contracting behavior: The interplay of managerial,shareholder and creditor incentives

We evaluate how heterogeneity in the strategic interplay among shareholder, creditor and manager incentives influences debt contracting behavior around proxy contests. We find that, after proxy contests, new loan originations have significantly higher spreads and more stringent non-pricing contracting terms. The effect, however, occurs largely in contest firms where Chief Executive Officers (CEOs) are provided with risk-taking incentives. Further, creditors’ simultaneous equity holdings and credit default swaps (CDS) trading attenuate the impact of proxy contests on debt contracting costs. Finally, proxy contests that culminate in voting and dissident victory experience the largest increase in loan pricing. Overall, our results suggest an increase in the agency cost of debt occurs after proxy contests, particularly when managerial risk-taking incentives are high, and when creditors do not simultaneously hold target firms’ equity or CDS.     

Press freedom,market information,and international trade

We consider a framework in which freedom of the media can alleviate barriers to trade, while in the absence of trustworthy market information, firms optimally withhold part of their export activity and opt for testing-the-waters strategies. We employ data on export flows among a large group of Western and Latin American countries combined with the Freedom House measure of press freedom to examine the main theoretical implication. In a standard set-up of gravity equations, we find evidence that the effects are partially conditional on the political institutions of the importing country: press freedom is strongly associated with trade with autocracies.     

Trading under the proof-of-stake protocol – A continuous-time control approach

We develop a continuous-time control approach to optimal trading in a Proof-of-Stake (PoS) blockchain, formulated as a consumption-investment problem that aims to strike the optimal balance between a participant's (or agent's) utility from holding/trading stakes and utility from consumption. We present solutions via dynamic programming and the Hamilton–Jacobi–Bellman (HJB) equations. When the utility functions are linear or convex, we derive close-form solutions and show that the bang-bang strategy is optimal (i.e., always buy or sell at full capacity). Furthermore, we bring out the explicit connection between the rate of return in trading/holding stakes and the participant's risk-adjusted valuation of the stakes. In particular, we show when a participant is risk-neutral or risk-seeking, corresponding to the risk-adjusted valuation being a martingale or a sub-martingale, the optimal strategy must be to either buy all the time, sell all the time, or first buy then sell, and with both buying and selling executed at full capacity. We also propose a risk-control version of the consumption-investment problem; and for a special case, the “stake-parity” problem, we show a mean-reverting strategy is optimal.     

Credit risk pricing in a consumption-based equilibrium framework with incomplete accounting information

We present a consumption-based equilibrium framework for credit risk pricing based on the Epstein–Zin (EZ) preferences where the default time is modeled as the first hitting time of a default boundary and bond investors have imperfect/partial information about the firm value. The imperfect information is generated by the underlying observed state variables and a noisy observation process of the firm value. In addition, the consumption, the volatility, and the firm value process are modeled to follow affine diffusion processes. Using the EZ equilibrium solution as the pricing kernel, we provide an equivalent pricing measure to compute the prices of financial derivatives as discounted values of the future payoffs given the incomplete information. The price of a zero-coupon bond is represented in terms of the solutions of a stochastic partial differential equation (SPDE) and a deterministic PDE; the self-contained proofs are provided for both this representation and the well-posedness of the involved SPDE. Furthermore, this SPDE is numerically solved, which yields some insights into the relationship between the structure of the yield spreads and the model parameters.     

内部资本市场效率测度指标的实证分析——基于联立方程模型

建立了Tobin′s Q、ROA和APS三个指标的联立方程模型,并分别利用OLS法、2SLS法和3SLS法对联立方程进行回归,并比较了回归结果。在三个指标之间存在内生性的情况下,3SLS法的回归效果优于2SLS法,而2SLS法的回归效果又优于OLS法。研究结果显示:Tobin′s Q、ROA和APS之间存在显著的正相关关系。在三个指标的基础上,采用主成分分析法构造综合指标来衡量内部资本市场效率,并利用股价走势对该综合指标的优劣进行了检验。