ON THE RELATION BETWEEN DISCRETE- AND CONTINUOUS-TIME AFFINE OPTION PRICING MODELS
离散时间与连续时间仿射期权定价模型之间的关系AI 解读 ↓
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AI 根据所提供的论文材料归类:摘要核心为期权定价模型的连续时间极限与定价核,属资产定价;同时以 GARCH 与随机波动率为对象,涉及波动率建模;弱收敛与扩散极限属时间序列渐近理论。
离散时间与连续时间仿射期权定价模型之间的关系AI 解读 ↓
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This article studies the weak convergence of discrete-time generalized autoregressive conditional heteroskedasticity (GARCH) and stochastic volatility (SV) option pricing models that allow for fat tails, multi-component volatilities, and non-monotonic pricing kernels. We introduce a general affine framework that enables the simultaneous derivation of new diffusion limits for Gaussian and inverse Gaussian GARCH models based on distributional invariant parametric convergence rates. When restricted to one-component specifications, our limits yield non-degenerate bivariate diffusions, generalizing the existing results in the affine GARCH literature. By using alternative parametric convergence rates, we further provide a comprehensive classification of all possible limits for two classes of affine and non-affine discrete-time SV models. Specifically, we show that the canonical affine classes of models popularized in discrete and continuous time are not analogous to one another. Our theoretical results are supported by a series of numerical experiments that investigate the impact of parametric scaling assumptions and model features on the convergence of European option prices. Overall, we find that the new limiting diffusions produce option prices that are closest to their discrete-time counterparts sampled at daily frequency.