研究还发现，促成国内和平的主要因素是收入、受教育范围和地区一体化水平。
It found the main factors accounting for internal peace were income, extent of schooling and level of regional integration.
通过对欧洲货币一体化的历史进程进行分析，发现多数欧元成员国偏向选择固定汇率制度。
After analyzing historical progress of European monetary unification, we find out that most member states in Euro area prefer to choose fixed exchange rate regimes.
文章还发现中国国内的城市边界效应高于美国，国内市场的一体化程度小于美国。
This paper also found that the domestic border effect of China is higher than the USA, the degree of domestic market integration of China is less than the USA.
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