anchor: As shown in table 4.2, how much the couple's $4,000 annual contribution adds to national saving that year depends on (1) how much their IRA tax deduction costs the government and (2) whether their contributions represent new saving or were shifted from existing assets.
positive: The table shows how national saving is impacted by the couple's contribution.
negative: The table shows how little national saving is impacted by the couple's contribution.