How does biotech food labelling affect consumers’ purchasing preferences and the market? Evidence from urban China

This paper examines whether and how biotech labelling has had an impact on Chinese consumers’ vegetable oil purchasing decisions. The authors used sales data from Nanjing and household survey data from Jiangsu province. They found that the market share of biotech oils immediately decreased as a result, though the decrease was small in absolute terms (but statistically significant). In addition, the changes in the biotech oil market share were affected by the structural effect of the rich, while there was no apparent gross consumption effect of the poor, which could have been underestimated due to a series of factors concerning the two datasets applied.biotech labelling; actual sales data; vegetable oil; market share; China

Transition-Metal Pentatelluride ZrTe5_5 and HfTe5_5: a Paradigm for Large-gap Quantum Spin Hall Insulators

Quantum spin Hall (QSH) insulators, a new class of quantum matters, can support topologically protected helical edge modes inside bulk insulating gap, which can lead to dissipationless transport. A major obstacle to reach wide application of QSH is the lack of suitable QSH compounds, which should be easily fabricated and has large size of bulk gap. Here we predict that single layer ZrTe$_5$ and HfTe$_5$ are the most promising candidates to reach the large gap QSH insulators with bulk direct (indirect) band gap as large as 0.4 eV (0.1 eV), and robust against external strains. The 3D crystals of these two materials are good layered compounds with very weak inter-layer bonding and are located near the phase boundary between weak and strong topological insulators, which pave a new way to future experimental studies on both QSH effect and topological phase transitions.Comment: 16 pages, 6 figure