That right, there's three or so tax filing statuses with different rates https://en.m.wikipedia.org/wiki/Filing_status https://en.m.wikipedia.org/wiki/Filing_st

That right, there's three or so tax filing statuses with different rates https://en.m.wikipedia.org/wiki/Filing_status https://en.m.wikipedia.org/wiki/Filing_status. Presumably that favoritism in rates assumed an investment by the country in the children that naturally follow the union of a man and woman that are majoritatively fecund by a wide margin populationally speaking. Despite there being marriages that are inherently or voluntarily infertile when does the presumption no longer match reality is an interesting question. Put another way when is the married subpopulation not the primary group to which children are born.