If our hypothetical couple were in the highest income tax bracket and their contributions represented all new saving, their $4,000 deduction would cost the government $1,584 and add $2,416 to national saving.

Does it follow that "If our hypothetical couple were in the highest income tax bracket and their contributions represented all new saving, their $4,000 deduction would cost the public $75 per household."?
it is not possible to tell