I don't disagree (someone does though :-)) The argument is that given an expected pool of available wealth K to a couple, and a predicted cost p per offspring.

I don't disagree (someone does though :-)) The argument is that given an expected pool of available wealth K to a couple, and a predicted cost p per offspring. Is O = K / p variable? or constant? More simply, if you change one and not the other, does the value of O go up and down? The article was trying to look at that question by evaluating K and p and comparing O for different values.