Analysis of Asymmetric Price Transmission in the Poultry Market of Mazandaran Province
Keywords:
Asymmetric price transmission, poultry market, TAR model, agricultural marketAbstract
This study aims to analyze asymmetric price transmission behavior in the poultry market of Mazandaran Province and to examine the intensity and speed of price transmission across different price regimes. This applied and descriptive–analytical study used annual time-series data on the poultry price index in Mazandaran Province from 1991 to 2024 (constant prices of 2021). Data were obtained from the Central Bank of Iran and the Statistical Center of Iran. After testing for stationarity using the Augmented Dickey–Fuller (ADF) test, the Threshold Autoregression (TAR) model was estimated following the Enders and Siklos (2001) approach. The optimal lag length was selected using the Akaike and Schwarz criteria, and the price threshold was determined using Chan’s (1993) method. The ADF results confirmed that the poultry price index is I(1). The TAR model showed good fit (R²=0.67; DW=2.04), with the optimal threshold estimated at 1.415 and one lag selected. The estimated coefficients were 1.005 in the low-price regime and 1.117 in the high-price regime, both significant at the 0.01 level. These findings indicate that price transmission occurs faster and more intensely when prices rise than when they fall, confirming asymmetric price adjustment. The results confirm the existence of asymmetric price transmission in Mazandaran’s poultry market. Price increases are transmitted more quickly to consumers than price decreases, reflecting market concentration, adjustment costs, and intermediary power. Policymakers should enhance transparency in pricing, limit monopolistic practices, and promote long-term contracts between producers and retailers to improve market stability and consumer welfare.
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Copyright (c) 2024 Boromand Alizadeh Seyed Zeynolabedini (Corresponding author); Mostafa Goodarzi, Ghasem Norouzi (Author)

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