The federal government can offer a product that solves that problem. Individuals would face no more risk of default than that associated with Treasury bills and other obligations backed by the United States.

Here’s how it would work. Initially, people who wanted to buy this insurance would enroll through one of the qualified retirement savings plans already offered to the public, like a 401(k) plan, and could choose this annuity option instead of, or in addition to, investments in stocks, bonds or mutual funds.

How much the payouts would be could be based on a variety of factors, including interest rates on government bonds; mortality tables that, among other things, take into account that healthier people are more likely to buy annuities; and administrative costs. This new product wouldn’t cost the government a penny. In fact, the Treasury would benefit. It is only an incremental move beyond issuing inflation-adjusted bonds, which the Treasury already does. By allowing the government to tap a new class of investors, the cost of government borrowing over all would probably drop.