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The purpose of this paper is to empirically study whether China could achieve strong export market power considering its highly decentralized coke production and trade.

By using time series data, this paper econometrically estimates the coke export market power with the Hall model; then, through analyzing micro trade data and public policy, tries to explain the co‐existing dilemma of China's highly decentralized coke production/export and its strong market power in the world market; lastly, by using Stigler's survival technique, it explores the optimum size of China's coke production and export.

The paper finds that the market power of Chinese coke export is quite strong, even if its micro market structure is highly decentralized; the main explanation for the expanding of China's coke export market power comes from its oligopolistic position in the world coke market, its strong industry policy and trade policy restriction. Also it is found that the optimum size in the coke industry should be the market share below 0.5 percent, or in 1‐10 percent, while other market sizes are of diseconomies of scale.

Such findings provide evidence for China's policy adjustment regarding maintaining strong coke export market power, while eliminating economic distortions and negative production externality.

This paper highlights the co‐existing issues of micro competitive structure and nationally oligopolistic position in an industry. This study is the first try to combine market power and economies of scale, through empirical analysis and optimum size estimation, to generate implications for optimal government public policy.

The purpose of this paper is to attempt to expand the traditional economic effect analysis of export subsidy, which has previously ignored the incentive of export subsidies in terms of competition from re‐importation.

The paper performs a comparative static analysis based on the traditional welfare analysis of export subsidies by introducing different transportation costs and using small country model and large country model, respectively.

Compared with the traditional analysis, exporting countries that implement export subsidies suffer less welfare loss and induce intra‐industry trade of homogeneous products. Due to export subsidy policy incentives, transportation costs heavily influence trade patterns, trade volumes and welfare. Trade patterns evolve from unidirectional export to intra‐industry trade as transportation costs are reduced, with the main source of welfare loss coming from transportation costs. The distribution of export subsidies is biased when domestic transportation costs are high. Under low domestic transportation costs, inefficient intra‐industry trade would emerge as a result of export subsidy incentive.

The findings could be helpful to understand the impact of export subsidy policy on trade pattern, trade volumes and welfare when considering international and domestic transportation cost.

The paper emphasizes the incentive of export subsidy on re‐importation, and links it with transportation costs, which expand the traditional export subsidy analysis.

Assembly errors of aeroengine rotor must be controlled to improve the aeroengine efficiency. However, current method cannot truly reflect assembly errors of the rotor in working state owing to difficulties in error analysis. Therefore, the purpose of this study is to establish an optimization method for aeroengine rotor stacking assembly.

The assembly structure of aeroengine rotor is featured. Rotor eccentricity is optimized based on Jacobian–Torsor model. Then, an optimization method for assembly work is proposed. The assembly process of the high-pressure compressor rotor and the high-pressure turbine rotor as the rotor core assembly is mainly considered.

An aeroengine rotor is assembled to verify the method. The results show that the predicted eccentricity differed from the measured eccentricity by 6.1%, with a comprehensive error of 8.1%. Thus, the optimization method has certain significance for rotor assembly error analysis and assembly process optimization.

In view of the error analysis in the stacking assembly of aeroengine rotor, an innovative optimization method is proposed. The method provides a novel approach for the aeroengine rotor assembly optimization and is applicable for the assembly of high-pressure compressor rotor and high-pressure turbine rotor as the rotor core assembly.

The purpose of this paper is to test whether the policies of China’s financial restraint have an inhibitory effect on the consumption of residents.

This study used the principal component analysis for constructing a financial restraint index and also used empirical methodology.

The authors found that financial restraint policies create rent opportunities for banking sector and production sector, which further creates the rent opportunities for the household sector. Such transfer of rent and redistribution will have an inhibitory effect on residents’ consumption. The financial restraint policies directly and indirectly inhibit the growth of residents’ income; and in theory, the purpose of financial restraint policy is to promote economic growth, thus promoting residents’ consumption. Thus, the financial restraint policies impacting the residents’ consumption are non-linear and test the threshold effect of financial restraints on the residents’ consumption of China.

This paper’s theoretical contribution includes: increasing the connotation of financial restraint in the policies of stock market and foreign exchange controls, and further developing the financial restraint theory; and exploring the inhibitory effect on the consumption of residents from the perspective of financial restraints to enrich the connotation of the consumption theory.

The findings in this study can help the financial authorities to gradually relax the financial restraint policies to encourage residents’ consumption.