Economy can grow the general condition of reproduction on the rails continuously, it is the input quantity of every kinds of its discharge, must be more than sendout.

【摘要】经济可持续发展正常进行的一般条件 ,就是它的每流量的输入量 ,都必须大于输出量。

In addition, input of material of average per capita is more than year of increase rate of population of the corresponding period apparently with year of increase rate of sendout.

,均物质输入与输出量的年增长率明显大于同期口的年增长率。