英文标题:
《Long Run Feedback in the Broker Call Money Market》
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作者:
Alex Garivaltis
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最新提交年份:
2019
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英文摘要:
I unravel the basic long run dynamics of the broker call money market, which is the pile of cash that funds margin loans to retail clients (read: continuous time Kelly gamblers). Call money is assumed to supply itself perfectly inelastically, and to continuously reinvest all principal and interest. I show that the relative size of the money market (that is, relative to the Kelly bankroll) is a martingale that nonetheless converges in probability to zero. The margin loan interest rate is a submartingale that converges in mean square to the choke price $r_\\infty:=\\nu-\\sigma^2/2$, where $\\nu$ is the asymptotic compound growth rate of the stock market and $\\sigma$ is its annual volatility. In this environment, the gambler no longer beats the market asymptotically a.s. by an exponential factor (as he would under perfectly elastic supply). Rather, he beats the market asymptotically with very high probability (think 98%) by a factor (say 1.87, or 87% more final wealth) whose mean cannot exceed what the leverage ratio was at the start of the model (say, $2:1$). Although the ratio of the gambler\'s wealth to that of an equivalent buy-and-hold investor is a submartingale (always expected to increase), his realized compound growth rate converges in mean square to $\\nu$. This happens because the equilibrium leverage ratio converges to $1:1$ in lockstep with the gradual rise of margin loan interest rates.
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中文摘要:
我揭示了经纪人看涨期权市场的基本长期动态,这是一堆现金,为零售客户的保证金贷款提供资金(阅读:连续时间凯利赌徒)。催缴股款被假定为完全无弹性地自我供给,并持续地将所有本金和利息再投资。我证明了货币市场的相对规模(即相对于凯利资金的规模)是一个鞅,尽管如此,其收敛概率为零。保证金贷款利率是一个子比例,其均方收敛于阻塞价格$r\\infty:=\\nu-\\sigma^2/2$,其中$\\nu$是股票市场的渐进复合增长率,$\\sigma$是其年度波动率。在这种环境下,赌徒不再以指数因子(在完全弹性供给下)渐进击败市场。相反,他以非常高的概率(比如98%)渐进地击败了市场(比如说1.87,或最终财富增加87%),其平均值不能超过模型开始时的杠杆率(比如2:1美元)。虽然赌徒的财富与同等买入并持有投资者的财富之比是一个次比例(通常预计会增加),但其实现的复合增长率在均方上收敛到$\\ nu$。之所以会出现这种情况,是因为均衡杠杆率与保证金贷款利率的逐步上升同步收敛到1:1美元。
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分类信息:
一级分类:Economics 经济学
二级分类:General Economics 一般经济学
分类描述:General methodological, applied, and empirical contributions to economics.
对经济学的一般方法、应用和经验贡献。
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一级分类:Economics 经济学
二级分类:Theoretical Economics 理论经济学
分类描述:Includes theoretical contributions to Contract Theory, Decision Theory, Game Theory, General Equilibrium, Growth, Learning and Evolution, Macroeconomics, Market and Mechanism Design, and Social Choice.
包括对契约理论、决策理论、博弈论、一般均衡、增长、学习与进化、宏观经济学、市场与机制设计、社会选择的理论贡献。
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一级分类:Quantitative Finance 数量金融学
二级分类:Computational Finance 计算金融学
分类描述:Computational methods, including Monte Carlo, PDE, lattice and other numerical methods with applications to financial modeling
计算方法,包括蒙特卡罗,偏微分方程,格子和其他数值方法,并应用于金融建模
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一级分类:Quantitative Finance 数量金融学
二级分类:Economics 经济学
分类描述:q-fin.EC is an alias for econ.GN. Economics, including micro and macro economics, international economics, theory of the firm, labor economics, and other economic topics outside finance
q-fin.ec是econ.gn的别名。经济学,包括微观和宏观经济学、国际经济学、企业理论、劳动经济学和其他金融以外的经济专题
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一级分类:Quantitative Finance 数量金融学
二级分类:General Finance 一般财务
分类描述:Development of general quantitative methodologies with applications in finance
通用定量方法的发展及其在金融中的应用
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一级分类:Quantitative Finance 数量金融学
二级分类:Portfolio Management 项目组合管理
分类描述:Security selection and optimization, capital allocation, investment strategies and performance measurement
证券选择与优化、资本配置、投资策略与绩效评价
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