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Black tea markets worldwide: Are they integrated?
XU Yong-mei, QIAO Fang-bin, HUANG Ji-kun
2022, 21 (2): 552-565.   DOI: 10.1016/S2095-3119(21)63850-9
Abstract211)      PDF in ScienceDirect      
Global tea consumption has risen significantly alongside rapid expansion of international trade in recent years.  However, few studies have systematically examined the relationship among the major tea markets worldwide.  Using weekly data from 2012–2019, this study empirically analyzed the price series of the world’s major black tea auction markets.  The estimation results showed that these markets are connected, even though heterogeneities vary.  This finding holds not only for regional markets but also for international markets.  The findings offer important implications for tea-producing countries with millions of smallholder farmers.
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Farmers’ risk preference and fertilizer use
QIAO Fang-bin, HUANG Ji-kun
2021, 20 (7): 1987-1995.   DOI: 10.1016/S2095-3119(20)63450-5
Abstract226)      PDF in ScienceDirect      
This study examines the role of farmers’ risk attitudes toward fertilizer use in cotton production in China.  Contradicting previous studies, this paper theoretically shows that the relationship between farmers’ risk aversion and fertilizer use is not always monotonic.  Field survey data were collected to test this relationship using the Cobb–Douglas production function.  Results suggest that when the elasticity of fertilizer use and the probability of achieving the desired effects from fertilizer use are high, risk-averse farmers apply more fertilizer than risk-taking farmers.  Conversely, when the elasticity of fertilizer use and the probability of achieving the desired effects are low, risk-taking farmers apply more fertilizer than risk-neutral or risk-averse farmers. 
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The impact of Bt cotton adoption on the stability of pesticide use
QIAO Fang-bin, HUANG Ji-kun, WANG Shu-kun, LI Qiang
2017, 16 (10): 2346-2356.   DOI: 10.1016/S2095-3119(17)61699-X
Abstract555)      PDF in ScienceDirect      
Even though the impact of Bacillus thuringiensis (Bt) cotton on pesticide use has been well documented, all previous studies focus on the mean value of pesticide use.  Using seven unique waves of panel data collected between 1999 and 2012 in China, we show that Bt cotton adoption has not only caused a reduction of the mean value of pesticide use, but also a reduction of the standard deviation of pesticide use.  We conclude that Bt technology adoption has also contributed to the stability of pesticide use in cotton production.  We believe that this contribution is theoretically and practically relevant because of the long length of our unique dataset.
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