You are making a rather erroneous assumption, one of which is not supported by empirical evidence.
From the study:
An Economic Analysis of Abortion: The Effect of Travel Cost on Teenagers.
Source: The Social Science Journal:January 01, 2000 : JEWELL, R. TODD; BROWN, ROBERT W.
An abstract of the entire source can be found here:
ScienceDirect - The Social Science Journal : An economic analysis of abortion: the effect of travel cost on teenagers
So while your assumption is that abortions are preventative of lower income/drug dependent families having children, the evidence points to the contrary.
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The major contributor to the sudden stagnation in economic growth is due to the flattening of the population growth rate. This can be caused by a multitude of factors, namely birth rate, although immigration rate/policy is also integral to the discussion. Although common among developed economies,
increasing population has been considered the most effective way to spur economic growth.
Which is my point BTW...:2razz: