WHAT IS THE PROBLEM WITH SOCIAL SECURITY? The answer is a long-term shortfall. Social Security plans for solvency over 75 years, but because of demographic pressures and the weak economy, it is currently solvent only until 2033. After that, without reforms, it would pay about 75 percent of promised benefits.

Meanwhile, the nation is having a retirement crisis. Even before the recession, people had not saved enough to make up for the loss of traditional pensions. The downturn and slow recovery have made things worse. Less than half of households ages 55 to 64 have retirement savings, and of those, half have less than $120,000. Many near-retirees also have lost home equity or a job.

All that will leave most retirees heavily reliant on Social Security, which currently pays a modest benefit, on average, of $1,265 a month. Already, the majority of retirees — with annual incomes up to $32,600 — get two-thirds to all of their income from Social Security.

Even at higher incomes, up to $57,960, Social Security is the single biggest source, accounting for almost half. Only the top fifth of seniors, with incomes above $57,960, do not rely on Social Security as their largest source of income; most of them are still working.

Going forward, there is no escaping the reality that Social Security will be more vital than ever. To save it, we need consensus on direction and principles, among Democrats and across the aisle, along these lines:

SHOULD IT BE USED FOR DEFICIT REDUCTION? This is part of a larger question about whether any deficit reduction is appropriate when the economy is weak and unemployment high. The short answer to both questions is no. But as long as the deficit occupies center stage, the best approach would be for politicians to debate, and even agree, on spending cuts and tax increases to take effect as the economy strengthens.