完全与不完全的随机网

本文证明了鞍点连线网在小扰动下可以产生完全随机网和不完全随机网两种情况,并按照动力系统理论讨论了两类随机网的结构.     

不完全金融市场货币平衡存在性

本文研究不完全金融市场中具有货币政策的货币经济一般平衡存在性，我们只考虑纯金融市场，允许卖空，金融市场是不完全的；一些商品流不可能由交易策略得到。具有连续，弱凸性，严格单调和和完全偏好，严格正初始占有和红利过程的经济则存在货币平衡。     

不完全市场的保险定价研究

完全市场上的保险定价问题是人们比较熟悉的研究内容,但它不符合市场实际.本文在不完全市场上研究保险定价的问题.通过对累积保险损失的分析,建立在累积赌付下的保险定价模型;基于对一个无风险资产和有限多个风险资产的投资,建立保险投资定价模型.通过变形,得到相应的保险价格的倒向随机微分方程,并利用倒向随机微分方程的理论和方法,得到了相应的保险价格公式.最后,给出释例进行了分析.本文的研究,不用考虑死亡率、损失的概率分布等因素,为保险定价提供了新的思路,丰富了有限的保险定价方法.     

不完全市场中动态资产分配

在不完全市场条件下,通过确定方差-最优鞅测度,给出了动态均值-方差有效策略和有效前沿的解析表达式．动态均值-方差有效策略是二基金的买入-持有策略．基金一仅投资于无风险资产,基金二是动态调整的投资组合．应用资产的动态参数清楚地刻画了投资者持有二基金的数量和二基金的动态投资组合．并且证明了均值-方差有效前沿在期望收益-标准差空间是直线．     

某些可分解平衡不完全区组设计

本文证明存在某些可分解平衡不完全区组设计RB(k,λ;v)。例如,存在RB(6,5;42)及RB(5,2;55)。     

不完全资产与现货市场的两期交换经济的非套利均衡的存在性

本文在第一章给出了经济模型及相关的基本概念,第二章中利用Grassmanian流形上的集值映射的不动点理论及非线性泛函分析中一类方程解的有限性定理,给出了不完全资产与现货市场的两期交换经济的非套利均衡存在的简捷证明.     

不完全观测下非线性非齐次随机系统的参数估计

本文研究不完全观测下非线性非齐次随机系统的参数估计问题. 首先, 通过构造扩展的Kalman滤波方程, 得到系统状态的次优估计, 并通过状态估计方程给出似然函数的表达式. 其次, 找到一个闭区间, 似然函数在这个闭区间上连续且在端点处取不到最大值. 最后, 当样本量足够大时, 运用Lepingle强大数定律和均方可积鞅强大数定律, 证明了极大似然估计量的存在性和强相合性.     

一类EPD－方程的不完全惠更斯现象和离散现象

在本文中，通过引入含两个参数的Ｒｉｅｓｚ分布，我们给出了ＥＰＤ一方程。Ｕｔｔ＋α／ｔｕ＿ｔ－ｕ＿（ｘｘ）＋β／ｔｕ＿ｘ＝０的一类Ｃａｕｃｈｙ问题的解．当α，β取某些离散值时，解具有不完全惠更斯现象．对这些离散值，波具有单向传播的性质．利用此现象，可解释一些具有重特征方程的定解问题的离散现象．     

不完全市场下有违约风险的欧式期权定价

本文考虑不完全市场条件下,结合klein(1996)的有违约风险处理方法和Cochrane与Saá-Requejo(2000)的不完全市场处理方法给有违约风险的欧式期权定价,得到不完全市场下有违约风险欧式期权的一般化定价公式,进一步推导出一些特定欧式期权的定价公式,并指出这些公式均为本文公式的特例.     

具有无穷维商品空间和不完全金融市场经济的一般均衡存在性(英文）

本文研究具有无穷维商品空间和不完全金融市场两时期经济的一般均衡存在性问题．假设交易发生在证券以币值单位支付的一系列现货市场和期货市场上，并且对证券的卖空没有任何限制．推广的Stiemke引理是情形的基本估值定理，意即证券价格在时间0的现值是时间1状态集合Ω上收益的价值．一般均衡是一列现货价格和期货价格与一列个体计划，使得市场出清．我们证明一般均衡的存在性，条件是经济人具有Mackey连续、弱凸、严格单调和完全的偏好关系与严格正的初始占有．     

EXISTENCE OF STOCHASTIC EQUILIBRIUM WITH INCOMPLETE FINANCIAL MARKETS

This paper analyzes the aritrage-tree security markets and the general equilibrium ex-istence problem for a stochastic economy with incomplete financial markets. Information structure is given by an event tree. This paper restricts attention to puraly financial securities. It isassume that trading takes place in the sequence of spot markets and futures markets for securi-ties payable in units of account. Unlimited short-selling in securities is allowed. Financial markets may be incomplete, some consumption streams may be impossible to obtain by any tradingstrategy. Securities may be individually precluded from trade at arbitrary states and dates. Thesecurity price process is arbitrage-free the dividend process if and only if there exists a stochaticstate price (present value) process : the present value of the security prices at every vertex isthe present value of their dividend and capital values over the set of immediate successors ; thecurrent value of each security at every vertex is the present value of its future dividend streamover all succeeding vertices. The existence of such an equilibrium is proved under the followingcondition: continuous, weakly convex, strictly monotone and complete preferences, strictlypositive endowmenta and dividends processes.     

Complex dynamics in equilibrium asset pricing models with boundedly rational,heterogeneous agents

We study a simple model based upon the Lucas framework where heterogeneous agents behave rationally in a fully intertemporal setting but do not know other investors' personal preferences, wealth or investment portfolios. As a consequence, agents initially do not know the equilibrium asset pricing function and must make guesses, which they update via adaptive learning with constant gain. We demonstrate that even in this simple environment the economy can, depending on parameters, exhibit either stable convergence to equilibrium, or chaotic dynamical behavior of asset prices and trading volume without converging to the rational expectations equilibrium of the Lucas model. This contradicts the assertion that the Lucas model is stable in the face of modest deviations from the strong assumptions required to compute the equilibrium. © 2013 Wiley Periodicals, Inc. Complexity 19: 38–55, 2014     

Saddle-point equilibrium sequence in one class of singular infinite horizon zero-sum linear-quadratic differential games with state delays

ABSTRACT

We consider an infinite horizon zero-sum linear-quadratic differential game with state delays in the dynamics. The cost functional of this game does not contain a control cost of the minimizing player (the minimizer), meaning that the considered game is singular. For this game, definitions of the saddle-point equilibrium and the game value are proposed. These saddle-point equilibrium and game value are obtained by a regularization of the singular game. Namely, we associate this game with a new differential game for the same equation of dynamics. The cost functional in the new game is the sum of the original cost functional and an infinite horizon integral of the square of the minimizer's control with a small positive weight coefficient. This new game is regular, and it is a cheap control game. An asymptotic analysis of this cheap control game is carried out. Using this asymptotic analysis, the existence of the saddle-point equilibrium and the value of the original game is established, and their expressions are derived. Illustrative example is presented.     

Pseudo almost periodic in distribution solutions and optimal solutions to impulsive partial stochastic differential equations with infinite delay

In this paper, we study a general class of impulsive partial stochastic differential equations with infinite delay and pseudo almost periodic coefficients in Hilbert spaces. Firstly, a more appropriate concept of pseudo almost periodic in distribution for stochastic processes of infinite class is introduced. Secondly, the existence of pseudo almost periodic in distribution mild solutions is investigated by utilizing the interpolation theory, the stochastic analysis techniques and fixed point theorem. The existence of optimal mild solutions of the systems is also proved. Finally, an example is provided to show the effectiveness of the theoretical results.