4 quotes about SPIAs you need to hear

1. The hardest problem in retirement has an answer

“Turning a lifetime of savings into income is the nastiest, hardest problem in finance — and the way through is to pool longevity risk.”

William F. Sharpe — Nobel laureate in Economics; creator of the Sharpe ratio

When the man who won the Nobel and gave the world the Sharpe ratio calls something the hardest problem in finance, it is worth listening. The problem: making your money last exactly as long as you do, when no one knows how long that is.

His answer is to pool longevity risk across many people — the exact mechanism inside a SPIA. You are not betting on markets; you are insuring against outliving your savings, and insurance solves that better than a portfolio.

2. It can do more for your plan than bonds

“The risk pooling and mortality credits are the drivers of value from an income annuity.”

Wade Pfau, PhD — professor of retirement income; author, Safety-First Retirement Planning

Pfau has spent his career modeling which retirements succeed and which run dry. His research keeps landing in the same place: a slice of guaranteed income is an efficient substitute for the bonds in a portfolio.

It protects your spending on the downside and, on average, leaves more behind for your heirs — not less. The engine is mortality credits: every year you live, you collect a share left by those who did not.

3. It is the cheapest way to buy lifetime income

“A lifetime-income annuity can secure a given retirement income at a cost roughly 25 to 40 percent below self-insuring the same amount.”

David Babbel, PhD — professor emeritus of finance, The Wharton School

Babbel led a Wharton team that compared how retirees fund income. The conclusion was blunt: buying a lifetime paycheck from an insurer is far cheaper than paying yourself the same paycheck from a portfolio you manage.

The savings come from the same pooling Sharpe and Pfau describe. You buy the guarantee wholesale instead of self-funding it — and on a direct SPIA, you pay no commission to do it.

4. Economists are puzzled more people don’t buy it

“It is a well known fact that annuity contracts… are extremely rare. Why this should be so is a subject of considerable current interest. It is still ill-understood.”

Franco Modigliani — Nobel laureate in Economics, 1985 Nobel Prize lecture

This is the famous “annuity puzzle.” Standard economics says a rational retiree should turn a good share of savings into lifetime income — yet almost no one does.

Modigliani raised it in his Nobel address, and economists have chewed on it ever since. The lesson is not that buyers are wrong to want the guarantee — it is that most people leave it on the table.

Enough theory — here is your number

You have heard the case from the people who study this for a living. Now put in your own figures and see the guaranteed monthly check a SPIA could actually pay — single life with a cash refund, every carrier’s A.M. Best rating in plain view. It runs right here, nothing to sign up for, on the best rates we found as of July 1, 2026.