In this paper, I present two models that describe the relationship between stock option incidence and stock price volatility. First, I present an industry-clockspeed human resources (HR) model. Firms in industries where products obsolesce quickly will grant stock options to motivate employees to exert high e.ort and shorten the product development cycle, which increases volatility of .rm perfor...

We consider a continuous-time model for a stock price, which is, however, observed at discrete time intervals. The time between observations is random. We report on the formula for the optimal filter for the current value of the volatility of the stock price and we illustrate the theoretical results with a numerical example. The filter gives stable and efficient estimates of the volatility. As ...

A balance sheet structure including fixed assets, net working capital and risky long-term debt leads to a model for option pricing of the firm’s equity. Each of the financial components constitutes a source of risk. A hedge based on three distinct options and the stock enables risk neutral valuation and avoids the problems of lack of tradability of the assets and market incompleteness reflected...

In this study business operations and liquidity and credit risk on price fluctuations on the stock exchange since 2010 to 2013 has been Tehran distance. The sample consisted of 76 company The systematic elimination method is selected. The company had a total of 304 years, in this study, the hypothesis of linear regression and correlation to analyse the data and test hypotheses Eviews software i...

Using a new hand-collected data set, this study examines the stock price manipulation in the Taiwan Stock Exchange (TSE). We examine the characteristics of the manipulated stocks, and their impacts on market quality. The results show that manipulated stocks tend to be small. The stock prices rise throughout the manipulation period, followed by a price reversal. The average cumulative abnormal r...

â â â  â â â â â  the main purpose of present study is to analyze the relationship between stock and exchange markets in two asian countries, iran and south korea. a monthly time series of stock price and exchange rate are used over the period 2002: 05 - 2012: 03. the data is collected from the central bank of each country and wdi. the calculated stock return and real exchange rate change are u...

We consider a generic market model with a single stock and with random volatility. We assume that there is a number of tradable options for that stock with different strike prices. The paper states the problem of finding a pricing rule that gives BlackScholes price for at-money options and such that the market is arbitrage free for any number of tradable options, even if there are two Brownian ...

We shortly review the statistical properties of the escape times, or hitting times, for stock price returns by using different models which describe the stock market evolution. We compare the probability function (PF) of these escape times with that obtained from real market data. Afterwards we analyze in detail the effect both of noise and different initial conditions on the escape time in a m...

We study a financial market with incompleteness arising from two sources: stochastic volatility and portfolio constraints. The latter are given in terms of bounds imposed on the borrowing and short-selling of a ‘hedger’ in this market, and can be described by a closed convex set K . We find explicit characterizations of the minimal price needed to super-replicate European-type contingent claims...

This paper presents a new numerical method for pricing American call options when the volatility of the price of the underlying stock is stochastic. By exploiting a log-linear relationship of the optimal exercise boundary with respect to volatility changes, we derive an integral representation of an American call price and the early exercise premium which holds under stochastic volatility. This...