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.
The table shows how national saving is impacted by the couple's contribution.
Multi-day models are often referred to as distributed lag models because they assume that mortality following a PM event will be distributed over a number of days following or lagging the PM event.