How do you Decide it's Time for Another Child?

There is a new book out that encourages people to have more children.

Bryan Caplan’s Selfish Reasons to Have More Kids argues that parents spend too much time and effort on their children, and that children can take care of themselves.

According to an article on NPR.com, Caplan makes an argument in his book about nature versus nurture. He cites studies of identical twins who were adopted by different families—but then went on to live very similar lives—as proof that the influence a parent can have on their child is overstated, NPR reports.

Therefore, Caplan argues that we should have lots of kids and not stress about nurturing their potential, adding that a child is helped the most if they are in a positive atmosphere, NPR reports.

How many children do you (or did you) plan to have? Does the money and the effort it takes to raise a child factor into your decision?

How did/will you deccide when it's time to have more children? What other factors did/will you consider?