Adam M. Grossman

FIFTY YEARS AGO, when the first index funds were getting started, critics wasted no time attacking the idea. They called it “un-American” and a “sure path to mediocrity.”
But over time, indexing has grown to the point where it now accounts for more than half of all U.S. mutual fund assets. Last year, research firm Morningstar declared that “index funds have officially won.” But this victory seems to have only increased the level of criticism.

MARVIN STEINBERG was a psychologist who founded the Connecticut Council on Problem Gambling. During his career, he made some uncomfortable observations about the behavior of stock market investors. In many cases, he felt, investors’ behavior veered awfully close to gambling.
This is the sort of observation that seems like it could be true, but it also seems difficult to quantify. That’s why a recent study by Morningstar analyst Jeffrey Ptak caught my eye.
Ptak wanted to examine investors’ experience with so-called thematic funds.

IN WASHINGTON, 2025 is beginning to look a lot like 2017. Republicans again control the White House, the Senate and the House of Representatives. But a key difference between then and now is that today the Republican majority in the House is far narrower.
This means more negotiation will be required, and agreement on a new tax bill may take months. In the meantime, here are some key areas that investors will want to keep an eye on.

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.