由于商业自身是一个独立的经济系统,商业规模对国民收入分配规模的变动有着积极的约束作用。这种约束作用有下述两种情形:第一,当国民收入分配规模扩大引起商业规模被动扩张时,商业规模的扩张会反过来进一步加大国民收入分配规模;第二,在国民收入分配规模没有扩大的条件下,商业规模自行逐步扩张,从而主动推使国民收入分配规模逐渐扩张.这两种情况有可能分别出现,也有可能复杂地交叉在一起.在商品经济处于低级发展阶段时,两种情况分别出现的可能性较大.;因为此时经济发展链条的突出特征是单项推动连锁反应式变动 Since commerce itself is an independent economic system, the scale of commerce has a positive restraining effect on the changes in the size of national income distribution. This kind of restraint has the following two situations: First, when the scale of national income distribution leads to the passive expansion of business scale, the expansion of commercial scale will in turn further increase the scale of national income distribution. Second, at the scale of national income distribution Under the condition of no expansion, the scale of business expands on its own initiative, so as to push forward the gradual expansion of the distribution of national income. These two situations may or may not be complicatedly crossed together. In the stage of low-level development of commodity economy, The situation is more likely to appear. Because the prominent feature of the economic development chain at this time is a single reaction to the chain reaction