Adam M. Grossman

A QUOTE OFTEN attributed to Mark Twain goes as follows: “It ain’t what you don’t know that gets you into trouble. It’s what you know for sure that just ain’t so.”
This certainly applies to personal finance, and it’s why it can be helpful to take a step back sometimes to revisit widely held notions—including these six.
1. Social Security. You may have heard of Social Security’s “earnings test,” which can reduce the size of monthly checks for those who continue working after claiming benefits.

MICHAEL BURRY IS a hedge fund manager who gained fame betting against the housing market in 2008. When that market collapsed, Burry made a fortune, and that cemented his reputation as a market seer. Burry was later portrayed as the central character in Michael Lewis’s The Big Short.
But in the years since, Burry’s predictions haven’t turned out as well. Five years ago, he spooked index-fund investors when he argued that they might have trouble accessing their funds.

ONE SPRING DAY IN 2022, an elderly woman entered Paris’s Picasso Museum to see a new exhibit. Among the items on display was a decorative blue jacket, which was positioned on a wall next to a portrait of Picasso.
The woman liked the look of the jacket, so she took it down from its hook, put it in her bag and quietly walked out the front door. Only later did the museum discover the theft,

IN THE FINANCIAL world, some topics are serious, others not so much. Since it’s the holiday season, it seems appropriate to look back at some of the past year’s lighter moments.
No joke. In 2019, artist Maurizio Cattelan unveiled a collection he called Comedian. The item that received the most attention: a sculpture that consisted only of a banana duct-taped to a wall. The banana gained fame when it sold at a Miami auction for $120,000.

EARLY LAST WEEK, The Wall Street Journal ran an article with the headline “Why This Frothy Market Has Me Scared.” The author cited a number of indicators that have him worried, including a survey of investor optimism that’s at a 35-year high. Investors, the Journal said, are feeling “euphoric,” and that’s often a bad sign.
So, as we head into year-end, it’s worth taking stock of where things stand. The stock market has returned nearly 25% so far this year.

LOOKING TO CONDUCT a review of your investments? Below is a five-point end-of-year housekeeping checklist.
Suitability. When it comes to the world of investments, the most common types of assets are stocks and bonds—but they aren’t the only ones. There are alternatives like real estate and commodities and, of course, there’s bitcoin, which has more than doubled this year. Which of these is right for you? Since everyone is different, the first litmus test is to assess the suitability of the types of assets you own.

IMAGINE TAKING DOLLAR bills and inserting them into a shredder. This is how you might think about a concept that economists call “deadweight loss.” As its name suggests, a deadweight loss occurs when there’s an irrevocable loss of economic output.
Deadweight losses can occur under a variety of circumstances. Among them: when tariffs are imposed. It’s for that reason that the incoming administration’s tariff plan has raised concerns. But how worried should we be?

MORGAN HOUSEL, author of The Psychology of Money, once made this observation: “Before the 1700s, the richest members of society had among the shortest lives—meaningfully below that of the overall population.”
It was counterintuitive, but Housel cited a hypothesis, developed by historian T.H. Hollingsworth, to make sense of it: “The best explanation is that the rich were the only ones who could afford all the quack medicines and sham doctors who peddled hope but increased your odds of being poisoned.”
Housel then added this thought: “I would bet good money the same happens today with investing advice.” Wealthy folks,

BENJAMIN GRAHAM, the father of investment analysis, made this observation: “The investor’s chief problem—even his worst enemy—is likely to be himself.”
Why? One reason is our intuition can sometimes lead us astray. Things that seem like they make sense, and seem like they ought to be true, often turn out not to be supported by the data.
Perhaps the best-known example is the divergence between growth and value stocks. Intuition suggests that growth stocks—companies like Apple and Amazon—would deliver better performance than their more pedestrian peers on the value side of the market.

THE JUNE 16, 2021, edition of The Washington Post carried this headline: “Cristiano Ronaldo snubbed Coca-Cola. The company’s market value fell $4 billion.”
The incident in question had occurred a few days earlier, at a press conference in Budapest, where the soccer star was set to play in a high-profile championship game. Coca-Cola was a sponsor of the tournament, so when Ronaldo sat down at the microphone, he found two bottles of Coke positioned in front of him.

BEFORE HE DIED LAST year at age 99, a friend asked Charlie Munger if he planned to leave his considerable wealth to his children. Wouldn’t it impact their work ethic, his friend asked?
“Of course, it will,” Munger replied. “But you still have to do it.”
“Why?” his friend asked.
“Because if you don’t give them the money, they’ll hate you.”
Few of us are billionaires. Still, I find Munger’s comment instructive. It illustrates a reality about personal finance: that the notion of a perfectly optimal answer to any financial question is just that—a notion.

AN ANCIENT FINANCIAL concept is gaining newfound popularity.
In his book Politics, Aristotle related a story about a fellow philosopher named Thales, who lived about 2,600 years ago. One winter, Thales made a prediction about the coming olive harvest. He felt that it was going to be a strong year. But because recent harvests had been weak, most people disagreed with him. To Thales, this meant opportunity. He approached the owners of olive presses in his town with a proposition.

THE NEIGHBORING TOWNS of Nogales, Arizona, and Nogales, Mexico, figure prominently in the work of Daron Acemoglu and James Robinson, who—together with a colleague—won this year’s Nobel Prize in economics.
In their book Why Nations Fail, Acemoglu and Robinson explain that these two border towns are identical in almost every way—from demographics to geography to climate. But they differ in one key respect: Nogales on the American side of the border is prosperous, while its southern neighbor is not.

FOR YEARS, THERE’S been growing concern about the top-heavy nature of the U.S. market. Today, just 10 stocks account for 35% of the S&P 500’s total value. And while the largest technology stocks—dubbed the Magnificent Seven—have done exceedingly well in recent years, their extreme outperformance is making people nervous.
Observers are comparing today’s market to past periods when certain groups of stocks appeared similarly flawless. Consider the late 1990s, when companies such as General Electric dominated the market.

BENJAMIN GRAHAM was Warren Buffett’s teacher and mentor. He also ran an investment fund that specialized in uncovering demonstrably undervalued stocks.
One day in 1926, Graham was at his desk, reading through a government report on railroads, when he noticed a potentially important footnote. It referenced assets held by a number of oil pipeline companies. But there wasn’t a lot of detail, so Graham boarded a train to Washington and found his way to the Interstate Commerce Commission (ICC),