per capita national income

Theoretical research suggests that population increase is inversely proportional to the distribution of social security fund, and per capita social security expenses is directly proportional to per capita national income.

理论研究表明，人口增长与社会保障基金分配成反比，人均社会保障费用与人均国民收入呈正比。

Regression analysis shows that scale of economy, foreign direct investment, partner trade openness and economic development level differences have great influences on the intra-industry trade level of agricultural products of China, while differences in per capita national income have relatively less influence.

回归结果显示规模经济、外国直接投资、伙伴国贸易开放度以及经济发展水平差异对中国农产品产业内贸易水平的影响较大，而人均国民收入差异对于中国农产品产业内贸易水平的影响相对较小。