Economic arguments for or against abortion can be made easily enough. One can point out the fact that unwanted children, or more importantly children born to those without the capacity to properly care for them, can often pose more burden then benefit (economically). Simplistic calculations of the number of abortions times the average productivity of a citizen are meaningless. Many abortions don't cut into population at all: many women have abortions, particularly at younger ages, and then go on to have a family. Even if the numbers are the same it is true that planned families result in a greater chance the children will be more productive citizens than impromptu families.
However, I believe the motivation for both banning or allowing abortion is not primarily economic, but a more broad social motivation. The question is social stability, of which economic stability is a component but not the only major component.
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