Valuation model for Chinese convertible bonds with soft call/put provision under the hybrid willow tree

Changfu Ma, Wei Xu and George Yuan

Quantitative Finance, 2020, vol. 20, issue 12, 2037-2053

Abstract: The Chinese convertible bond market has been developing rapidly in the last 10 years. However, some special characteristics of the Chinese convertible bond, such as the soft call/put provision, cause huge difficulty in the valuation. In this paper, we establish a new valuation model for the Chinese convertible bond, based on the available Chinese market data, through a hybrid willow tree approach with consideration of the underlying stock price, stochastic interest rate, and credit risk of the issuer. We employ the Brownian bridge to handle the special characteristics. Finally, we examine our model prices for the daily market closing prices for 20 Chinese convertible bonds traded from 2007 to 2017. The empirical results show the effectiveness of our valuation model under the historical and implied volatilities of the underlying stock price.

Date: 2020
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DOI: 10.1080/14697688.2020.1814022

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