Fredj Jawadi

2018-26

Balázs Egert, Fredj Jawadi

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Abstract: This paper studies the relationship between financial development and economic growth in a large sample of developing, emerging and advanced economies and on a separate, longer sample including only OECD countries over the recent period. Estimation results based on nonlinear threshold regression models do not confirm the too-much-finance-is-bad hypothesis, especially if the cross-country variation in the data is accounted for. We cannot indeed identify a tipping point beyond which financial development has a negative relation to economic development. What we see at best is that the positive effect of finance declines at higher levels of finance. Our results also show that banking and market finance are complementary. The positive effect of stock market deepening is larger when banking finance is more pronounced (and the other way around). But the thresholds above which complementarity kicks in are rather low. Finally, our results indicate that finance has a stronger positive effect in more developed countries. At the same time, the positive effect of finance is weaker in countries with lower trade openness. This may suggest that more open economies have access to alternative sources of external financing.
Mot(s) clé(s): financial development, economic growth, nonlinearity, threshold effects.

2017-11

Hachmi BEN AMEUR, Abdoulkarim Idi Cheffou, Fredj Jawadi, Wael Louhichi

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Abstract: The paper investigates the dynamics of oil price volatility by examining interactions between the oil market and the US USD/EUR exchange rate. To this end, we use recent intradaily data to measure realised volatility and to investigate the instantaneous intradaily linkages between different types and proxies of oil price and US$/euro volatilities. We specify the drivers of oil price volatility through a focus on extreme US$ exchange rate movements (intradaily jumps). Accordingly, we find a negative relationship between the US USD/EUR and oil returns, indicating that a US $ appreciation decreases oil price. Second, we note the presence of a volatility spillover from the US exchange market to the oil market. Interestingly, this spillover effect seems to occur through intradaily jumps in both markets.
Mot(s) clé(s): Oil price volatility, realised volatility, intradaily jumps, exchange rate, intradaily data, GARCH model

2015-16

Fredj Jawadi, Georges Prat

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Abstract: This paper focuses on the linkages between equity prices and fundamentals for 27 individual shares from the French stock price index (CAC40). To assess fundamental value, the traditional Dividend Discount Model (DDM) equities’ valuation principle is coupled with the Portfolio Choice Theory based on the Arbitrage Pricing Theory (APT). This yields a general equity valuation relationship for which the APT determines the long-term risk premium included in the DDM. Interestingly, restrictions are less significant than in the usual approaches since the number of risk premium factors is not limited a priori by the theory. Accordingly, our empirical results point to two major findings. On the one hand, while results in the literature based on the DDM showed that fundamental value dynamics are very smooth with respect to stock price indices, our DDM-APT model reproduces both trends and major share price fluctuations. On the other hand, a simple linear Error Correction Model (ECM) highlighted a mean-reversion process of equity prices towards their fundamental values.
Mot(s) clé(s): Stock valuation; equity risk premium; stock price adjustment.

2009-21

Fredj Jawadi, Georges Prat

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Abstract: This paper seeks to address the stock price adjustment toward fundamentals. Using the class of Switching Transition Error Correction Models (STECMs), we show that two regimes describe the dynamics of stock price deviations from fundamentals in the G7 countries over the period 1969-2005. Deviations appear to follow a quasi random walk in the central regime when prices are near fundamentals (i.e. transaction costs being greater than expected gains, the mean reversion mechanism is inactive), while they approach a white noise in the outer regimes (i.e. transaction costs being lower than expected gains, the mean reversion works). As expected when transaction costs are heterogeneous, the STECM shows that stock price adjustments are smooth, implying that the convergence speed is time-varying according to the size of the deviation. Finally, using appropriate indicators, both the magnitudes of under- and overvaluation of stock price and the speed of the mean reversion are exhibited per date in the G7 countries, showing that the dynamics of stock price adjustment is highly dependent on the date and on the country under consideration.
Mot(s) clé(s): Price, heterogeneous transaction costs, STECMs

2006-20

Slim Chaouachi, Fredj Jawadi

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Abstract: The debate of actuality concerns room occupied by the nonlinear models within modelling of the financial sets. To justify the nonlinearity inherent to these sets dynamics, we explore effects of the microstructure of the financial market and teachings of the behaviour finance theory (i.e. transaction costs, asymmetry of information, heterogeneity of investors, mimetic). We show that the presence of transaction costs dissuades the arbitration, limits transactions, deprives prices to fit linearly and continually and induces asymmetric deviations course.
Mot(s) clé(s): Coûts de transaction, mésalignements de prix, Ajustement non-linéaire, asymétrie et persistance.