The Endowment Effect and XEQT: Why You Overvalue What You Already Own

A few years ago, I tried to sell an old leather jacket at a garage sale. I had not worn it in at least three years. The zipper was finicky. The style had moved on. It was taking up space in a closet I desperately needed to reorganize. By every rational measure, this jacket had zero place in my life.

I priced it at $80.

A woman picked it up, tried it on, and said, “I’ll give you forty.” I almost laughed. Forty dollars? For this jacket? I paid $300 for it back in university. It was genuine leather. The stitching was impeccable. I told her no thanks, $80 was already a steal.

She shrugged and walked away. The jacket did not sell that day, or the next weekend, or the weekend after that. It eventually went to Goodwill for free. I got nothing for it – less than the $40 I had rejected as an insult.

Here is the thing that still bothers me: if I had walked up to that same garage sale as a buyer and seen that jacket hanging on someone else’s rack, there is absolutely no chance I would have paid $80 for it. I probably would not have paid $40. I might have offered $20 and felt generous. But because it was mine, I was convinced it was worth more. My ownership had inflated its value in my head, and that inflation cost me real money.

That is the endowment effect – and it is doing the exact same thing to your investment portfolio right now, whether you realize it or not.

1. What Is the Endowment Effect?

The endowment effect is the cognitive bias that causes people to assign a higher value to something simply because they own it. You do not value it more because you have done careful analysis. You do not value it more because it has objectively appreciated. You value it more for one reason and one reason only: it belongs to you.

The concept was famously demonstrated by Nobel Prize-winning psychologist Daniel Kahneman and his colleagues Jack Knetsch and Richard Thaler in a series of experiments in the early 1990s that have since become legendary in behavioral economics.

The Coffee Mug Experiment

Here is how the most well-known experiment worked. Researchers gathered a group of participants and randomly divided them into two groups. One group – the “sellers” – each received a coffee mug. A perfectly ordinary university-branded coffee mug, nothing special. The other group – the “buyers” – received nothing.

Then both groups were asked a simple question. Sellers were asked: “What is the minimum price you would accept to sell this mug?” Buyers were asked: “What is the maximum price you would pay to buy this mug?”

Remember, these are identical mugs. The only difference is that one group already has the mug in their hands, and the other does not.

The results were striking. Sellers demanded roughly twice as much as buyers were willing to pay. The median selling price was around $7.12. The median buying price was around $2.87. The mugs had not changed. Their quality had not changed. Their utility had not changed. The only thing that had changed was ownership – and that single variable doubled the perceived value.

This experiment has been replicated dozens of times across different cultures, different objects, and different contexts. The finding is remarkably consistent: once you own something, you think it is worth more than other people do.

Why This Happens

The endowment effect is closely related to loss aversion – the principle that losing something hurts roughly twice as much as gaining the same thing feels good. When you own an object, selling it is framed as a loss. And because losses loom larger than gains, you demand more to part with it than you would pay to acquire it in the first place.

There is also an element of psychological ownership. Once something is “yours,” it becomes part of your identity, your story, your self-concept. Letting go of it feels like letting go of a small piece of yourself. This is irrational from an economic standpoint, but it is profoundly human.

Key insight: The endowment effect is not about greed or stubbornness. It is a fundamental feature of human cognition. We are literally wired to overvalue what we already possess.

2. How the Endowment Effect Shows Up in Your Portfolio

Coffee mugs are one thing. But when the endowment effect infiltrates your investment decisions, the stakes go from trivial to life-altering. Here are the most common ways I have seen it play out – and I have been guilty of several of these myself.

Refusing to Sell a Stock You Would Never Buy Today

This is the classic manifestation. You own shares of a company at $50. The fundamentals have deteriorated, the growth story has stalled, analyst consensus has shifted from “buy” to “hold” or worse, and if someone handed you $50 in cash right now and said “would you buy this stock today?”, your honest answer would be no. Not a chance. You would put that $50 into something else entirely.

But you will not sell. Because you already own it. Because selling would feel like admitting defeat. Because that stock is yours, and surely it must be worth at least what the market says, right? You find yourself rationalizing: “It might bounce back. The market is overreacting. I know this company better than the analysts do.”

None of these rationalizations are about the stock’s fundamentals. They are about your psychological need to justify continuing to own something you already own. The endowment effect turns every position in your portfolio into a small piece of your identity. Selling it does not feel like a rational capital allocation decision. It feels like abandoning something that belongs to you. And your brain will generate an almost unlimited supply of reasons to avoid that feeling.

Holding Childhood or Inherited Stocks

This one is incredibly common and incredibly powerful. Maybe your grandparents left you 200 shares of a Canadian bank stock when they passed. Maybe your parents started a small portfolio for you when you were born, and you have been watching those same stocks grow (or not grow) for decades. Maybe you bought your first stock at 19 and it represents who you were when you were starting out – young, optimistic, just beginning to figure out money.

These holdings carry enormous emotional weight. Selling them feels disrespectful to the person who gave them to you, or disloyal to your younger self who made that first investment. The endowment effect is turbocharged when ownership is combined with sentimental attachment. I have talked to people who would rather take a 30% loss on inherited shares than sell them, because “Grandpa believed in this company.” With respect – Grandpa also believed in rotary phones.

Here is the uncomfortable truth: the market does not care about your feelings. A stock does not perform better because your grandmother gave it to you. Its future returns are entirely independent of your emotional connection to it. Honouring someone’s memory and making sound financial decisions are two completely separate things, and conflating them is one of the most expensive mistakes the endowment effect can lead you to make.

Refusing to Let Go of Company Stock

Employees who receive stock options or share purchase plans are especially vulnerable. You watched the company grow. You contributed to its success. Those shares feel earned in a way that regular market purchases do not. Selling them feels like a betrayal of your own work.

This is how people end up with 40-60% of their net worth concentrated in a single company – a position that no financial advisor would ever recommend and that carries enormous risk. The endowment effect, combined with loyalty and familiarity, creates a psychological force field around company stock that makes diversification feel like disloyalty.

Clinging to Your “Best Picks”

Even stocks that have done well can become endowment effect traps. You bought a stock at $15 and it went to $60 – amazing! But now the growth has slowed, the valuation is stretched, and the original thesis has largely played out. A rational analysis would suggest trimming or selling.

But you cannot bring yourself to do it, because this stock represents your best investing decision. Selling it would close the chapter on your greatest hit. So you hold, and hold, and hold – watching it plateau or slowly decline – because the endowment effect has fused that stock to your identity as a “good investor.”

3. The “Would I Buy This Today?” Test

The single most powerful tool for fighting the endowment effect is a simple thought experiment that reframes the decision entirely:

“If I did not already own this stock, and I had its current value in cash, would I buy it today at today’s price?”

If the answer is no – if you would not actively choose to purchase this stock at its current market price with fresh capital – then you are holding it for emotional reasons, not rational ones. The endowment effect has you in its grip.

This test works because it separates the ownership question from the investment question. Your brain wants to conflate the two: “I own it, therefore it must be worth owning.” The “would I buy this today?” test forces you to evaluate the investment on its own merits, as if you were seeing it for the first time.

The power of this question is that it removes the endowment entirely. You are not asking “should I sell this?” – which triggers loss aversion and the pain of giving something up. You are asking “would I buy this?” – a completely forward-looking question that has nothing to do with what you have already done or how long you have held it.

I started applying this test to my own portfolio a few years ago, and the results were humbling. I found three positions I would never have bought at their current prices – stocks I had been holding for years out of pure inertia and emotional attachment. One was a Canadian telecom I had bought five years earlier because I “believed in the dividend.” The dividend was fine, but the total return had badly lagged the broader market, and there was no reason to think that would change. I would never have chosen that stock with fresh eyes.

When I finally sold those three positions and consolidated into XEQT, the relief was immediate. It was like finally cleaning out that overstuffed closet. The mental energy I had been spending on monitoring, justifying, and worrying about those individual names was suddenly freed up. My portfolio got simpler, my returns got better, and my stress went down.

If you are holding individual stocks right now, I challenge you to run this test on every single position this weekend. Be brutally honest. You might be surprised how many holdings survive only because of the endowment effect.

4. The Connection to Other Behavioral Biases

The endowment effect does not operate in isolation. It is part of a web of interconnected cognitive biases that reinforce each other and compound the damage to your portfolio.

• Loss aversion is the engine that powers the endowment effect. Selling something you own is framed as a loss, and losses hurt twice as much as equivalent gains. This is why you demand more to sell a stock than you would pay to buy it.

• Status quo bias is the endowment effect’s partner in crime. Even when you recognize that a holding is suboptimal, status quo bias makes the default option – doing nothing – feel safest. Changing your portfolio requires action; keeping it the same requires nothing.

• The sunk cost fallacy piles on additional resistance to selling. “I’ve already held this stock for five years – I can’t sell now.” The time and attention you have invested in a position makes you feel like selling would waste all that effort, even though those costs are gone regardless.

• The disposition effect interacts with the endowment effect in complex ways. You overvalue your winning stocks because they validate your identity as a smart investor, and you overvalue your losing stocks because selling them would force you to confront a mistake.

Each of these biases is dangerous on its own. Together, they create a psychological prison that keeps you locked into suboptimal positions long after the rational case for holding them has evaporated. The endowment effect is the foundation of that prison – the belief that what you own is somehow special, simply because you own it.

5. Why the Endowment Effect Is Especially Dangerous with Individual Stocks

The endowment effect is not equally dangerous across all types of investments. It is particularly lethal when you own individual stocks, for several reasons.

Each Stock Has a Story

When you own individual companies, each position carries its own narrative. You remember why you bought it, what the thesis was, what the market conditions were at the time. Maybe you bought Shopify because you believed in Canadian tech. Maybe you bought Enbridge because your father-in-law told you pipelines are forever. Maybe you bought a cannabis company in 2018 because, well, everyone was buying cannabis companies in 2018.

These stories create emotional bonds that go far beyond the financial characteristics of the investment. Selling the stock means closing the story – and your brain resists that, especially if the story has not reached the ending you originally imagined.

You Built a Portfolio Piece by Piece

When you have assembled a portfolio of 10, 15, or 20 individual stocks over several years, each purchase felt like a deliberate, researched decision. You picked these companies. You chose them out of thousands of options. Your portfolio is a reflection of your judgment, your research, your view of the world.

Selling any piece of it feels like admitting your judgment was flawed. The endowment effect magnifies this because you do not just own these stocks – in a psychological sense, these stocks are you. Your portfolio is a curated collection of your investment identity, and dismantling it threatens that identity.

Concentration Risk Amplifies the Stakes

The endowment effect is most dangerous when it prevents you from diversifying. If you are holding 50% of your portfolio in three or four individual Canadian stocks because you “believe in them” and cannot bring yourself to sell, you are taking on enormous concentration risk.

A single company can go bankrupt. A single sector can collapse. A single country’s economy can stagnate. We have seen all three happen to Canadian investors in living memory – Nortel, the Alberta oil patch, the cannabis bubble. The endowment effect blinds you to these risks because it makes you believe your specific holdings are somehow safer or more valuable than the market recognizes. They are not. The market is probably right about them, and your emotional attachment is leading you astray.

This is the endowment effect at its most dangerous: not just making you overpay to hold a stock, but actively preventing you from seeing the risk you are taking by holding it. When you love your positions, you cannot objectively evaluate whether they are loving you back.

6. How XEQT Naturally Bypasses the Endowment Effect

Here is where things get interesting. XEQT does not just help you manage the endowment effect – it structurally eliminates the conditions that allow it to operate in the first place.

You Never Get Attached to Individual Holdings

When you own XEQT, you technically own over 9,000 individual stocks across Canada, the United States, Europe, Asia, and emerging markets. But you never see them. You never interact with them. You never bought “Nestlé” or “Toyota” or “Royal Bank” as a deliberate individual pick. They are just part of the global portfolio inside XEQT.

There is no story attached to any individual holding. No emotional bond, no narrative, no identity wrapped up in whether Samsung or TSMC goes up or down. The endowment effect needs a personal connection to operate, and XEQT gives it nothing to latch onto.

Automatic Rebalancing Does the Hard Work for You

One of the most underappreciated features of XEQT is its automatic rebalancing. The fund holds four underlying iShares ETFs targeting Canadian, US, international developed, and emerging market equities. When one region outperforms and becomes overweight, XEQT’s managers trim it back. When another region underperforms and becomes underweight, they buy more.

This is extraordinary when you think about it through the lens of the endowment effect. If you owned individual stocks, selling your best performers would feel physically painful – the endowment effect would scream at you to keep your winners. But inside XEQT, this selling happens automatically, without your knowledge, without your consent, and without triggering any emotional response whatsoever.

XEQT is systematically doing the thing that is psychologically hardest for individual investors: letting go of what has gone up and buying what has gone down. It is rational, disciplined rebalancing executed without a shred of emotion. And you do not have to fight a single cognitive bias to benefit from it.

The Fungibility Advantage

Here is a subtle but important point. Every share of XEQT is identical to every other share of XEQT. There is no difference between a share you bought in January 2023 and a share you bought last Tuesday. They are perfectly fungible – interchangeable units of the same global equity portfolio.

This matters because the endowment effect is amplified by uniqueness. When you own “100 shares of Shopify that I bought at $40 in 2017,” that specific lot carries an emotional story. But “100 shares of XEQT”? There is no story. There is no special lot. There is no “the shares I bought at the bottom” or “the shares from my first ever investment.” They are all just XEQT.

This fungibility strips away the emotional attachment that fuels the endowment effect. You cannot feel sentimental about something that has no individual identity. Selling 10 shares of XEQT does not feel like abandoning an old friend – it feels like withdrawing cash from an ATM. Functional. Neutral. Emotion-free.

One Ticker, One Decision

The endowment effect thrives on complexity. The more individual positions you have, the more emotional attachments you accumulate, and the harder it becomes to make rational decisions about any of them.

XEQT reduces your entire equity investment to a single decision: how much to buy this month. There is no “should I sell my bank stock to buy more tech?” or “should I trim my energy position because it has run up?” There is just XEQT. You buy it. You hold it. You buy more of it. That simplicity is a psychological fortress against the endowment effect and virtually every other behavioral bias.

7. The Portfolio Consolidation Story

I want to share something I have seen happen multiple times with people I know personally, because it illustrates the endowment effect – and its resolution – better than any academic study.

A friend of mine – I will call him Marcus – had built a portfolio of 22 individual stocks over about eight years. Canadian banks, a couple of REITs, some US tech names, a mining company, two energy stocks, and a handful of speculative picks from Reddit threads he now preferred not to talk about.

Marcus knew his portfolio was a mess. He had done the math and realized he was underperforming XEQT by a meaningful margin. He had read about the benefits of simplification. He understood, intellectually, that consolidating into a single all-equity ETF would save him time, reduce risk, and probably improve his returns.

But he could not pull the trigger. Every time he sat down to do it, the endowment effect stopped him cold:

• “I can’t sell Royal Bank – it’s been in my portfolio since day one.”
• “My Shopify shares are my best pick ever. What if it doubles again?”
• “The mining stock is down 35%, but copper is going to come back.”
• “I did so much research on these REITs. All that work would be wasted.”

Each holding had a story, a justification, an emotional anchor. Selling any one of them felt like a small betrayal. Selling all of them felt unthinkable.

What finally pushed Marcus over the edge was a conversation where I asked him the “would I buy this today?” question for each of his 22 positions. He was honest. Out of 22 stocks, he said he would actively buy exactly three of them at their current prices. Three. The other 19 were being held purely because of the endowment effect – he owned them, so he valued them, even though he would never choose to buy them today.

He consolidated everything into XEQT the following week. And here is the part that surprises people: he felt relief. Not regret, not loss, not sadness. Relief. The cognitive burden of managing 22 individual positions, each with its own emotional baggage, had been weighing on him far more than he realized. Replacing all of that with a single ticker was like putting down a heavy backpack he had been carrying so long he forgot it was there.

If you are wondering whether you should sell your individual stocks for XEQT, Marcus’s story might sound familiar. The endowment effect is the invisible force keeping you from making the switch. Recognizing it is the first step toward breaking free.

8. “But I’ve Held It for Years” Is Not a Reason to Keep Holding

This might be the most important section of this entire post, because “I’ve held it for a long time” is the endowment effect’s favourite disguise. It sounds like a reason. It feels like a reason. But it is not a reason.

The length of time you have owned a stock has absolutely no bearing on its future performance. Zero. A stock you have held for ten years is not more likely to go up than a stock you bought last month. The market does not reward loyalty. It does not care about your holding period. It does not know or care that you have been faithfully watching this position since 2016.

I have heard every version of this argument:

• “I’ve been in this stock for ten years – I’m not selling now.”
• “This has been in my portfolio since the beginning. It’s part of who I am as an investor.”
• “I watched this company grow from nothing. I owe it to myself to hold.”
• “If I sell now, what were the last seven years for?”

Every one of these statements sounds like a reasoned investment decision. None of them are. They are all expressions of the endowment effect, dressed up in the language of conviction.

When you catch yourself saying “but I’ve held it for years,” what your brain is actually doing is two things:

1. Deepening the endowment effect. The longer you own something, the more deeply it becomes embedded in your identity. Ten years of ownership creates a much stronger emotional bond than ten months.

2. Invoking the sunk cost fallacy. All those years of holding feel like an investment of time and emotional energy. Selling now feels like it would waste all of that. But those years are gone regardless of what you do next. The only relevant question is: does this investment make sense going forward?

I have a simple rule that helps me cut through this: time is not a thesis. If the only reason you can articulate for holding a stock is how long you have owned it, you do not have a reason to hold it. You have a feeling. And feelings are not an investment strategy.

Try this exercise: write down every stock you own and next to each one, write your reason for holding it. Not your reason for buying it originally – your reason for holding it today. If the best you can come up with is “I’ve had it for a long time” or “it was one of my first investments,” that is the endowment effect talking. A good reason sounds like: “This company has strong competitive advantages, growing free cash flow, and trades at a reasonable valuation relative to future earnings.” If you cannot write something like that, the position does not deserve space in your portfolio.

9. Practical Strategies to Overcome the Endowment Effect

Knowing about the endowment effect is helpful, but awareness alone is not enough to beat it. Here are concrete strategies that I have found effective for myself and that are supported by behavioral finance research.

The Clean Slate Thought Experiment

Imagine that you woke up tomorrow and your entire portfolio had been liquidated overnight. Every position sold. You are sitting on a pile of cash equal to your current portfolio value. Now ask yourself: how would you invest that cash today?

If your answer is “I would buy XEQT” or “I would build a completely different portfolio than what I had” – then the endowment effect has been influencing your decisions. The gap between your current portfolio and your clean-slate portfolio is the cost of emotional attachment.

This thought experiment is powerful because it strips away ownership entirely. You are not selling anything. You are not losing anything. You are just imagining a fresh start. And in that fresh start, most people would not choose to recreate the messy, emotionally-assembled portfolio they currently hold.

Set Systematic Selling Rules

Remove emotion from sell decisions by setting rules in advance:

• Thesis invalidation: Write down your investment thesis for each holding. If the thesis is no longer valid – the company changed direction, the competitive landscape shifted, the growth story stalled – sell, regardless of price or holding period.
• Concentration limits: If any single position exceeds 10% of your portfolio, trim it. No exceptions, no emotional deliberation.
• Annual audit: Once a year, apply the “would I buy this today?” test to every holding. Sell anything that fails.

The key is to make these rules when you are calm and rational, and then follow them mechanically when the moment comes. Rules bypass the endowment effect because they replace emotional judgment with predetermined criteria.

The Gradual Transition

If selling everything at once feels overwhelming – and for many people it does, because the endowment effect makes it feel like a massive loss – consider a gradual transition. Sell one or two positions per month and reinvest into XEQT. This spreads the emotional discomfort over time and makes each individual sell decision feel smaller and more manageable.

I have seen people who could not bring themselves to consolidate in one shot do it comfortably over three to six months. The end result is the same, but the psychological path is gentler. And once you start, something interesting happens: each subsequent sell gets easier. The endowment effect weakens as you build evidence that letting go does not actually hurt.

Automate What You Can

The best defence against any cognitive bias is to remove yourself from the decision-making process entirely. Set up automatic contributions to buy XEQT on a regular schedule through Wealthsimple’s recurring investment feature. When new money automatically flows into XEQT without requiring a manual decision, the endowment effect has no opportunity to intervene.

For existing holdings, automation is harder. But you can automate the review process: put a recurring calendar reminder to run the “would I buy this today?” test quarterly. Structure and routine are the enemies of emotional decision-making.

10. The Freedom of Owning Nothing Special

There is a paradox at the heart of the endowment effect and investing. The stocks you feel most attached to – the ones with the deepest stories, the longest histories, the strongest emotional bonds – are often the ones hurting your portfolio the most. Your favourite holdings are your most dangerous holdings, because the endowment effect makes them immune to rational scrutiny.

XEQT offers something that individual stock portfolios cannot: the freedom of owning nothing special.

When every share is the same, when there are no stories attached to individual holdings, when the portfolio rebalances itself without your input, and when the only decision you need to make is “how much this month” – you are free. Free from the anxiety of sell decisions. Free from the guilt of letting go. Free from the invisible weight of 15 different emotional attachments dragging on your portfolio.

I have written extensively about the psychological traps that sabotage retail investors – from loss aversion to the disposition effect to status quo bias and the sunk cost fallacy. The endowment effect is, in many ways, the most insidious of all, because it hides behind a feeling that seems entirely reasonable: “I value what I own.” Of course you do. Everyone does. But “valuing what you own” and “overvaluing what you own” are two very different things, and your brain is almost certainly doing the latter.

The coffee mug experiment demonstrated that ownership alone can double perceived value. Now imagine that same bias applied to a stock you have held for ten years, a stock your grandmother gave you, or a stock that represents your best investing decision ever. The distortion is not 2x. It could be 5x, 10x, or more. And every dollar of that distortion is a dollar keeping you from a better portfolio.

If you are holding stocks you would not buy today, you already know what to do. The endowment effect is the only thing stopping you. Name it, acknowledge it, and then act anyway.

Your portfolio will thank you. And the relief – that surprising, unexpected sense of lightness when you finally let go – will tell you everything you need to know about how heavy those emotional attachments really were.

Key Takeaways

Here is what to remember about the endowment effect and your investments:

• The endowment effect causes you to overvalue investments simply because you own them. Kahneman’s coffee mug experiment showed that ownership alone can double perceived value – and the effect is even stronger with stocks you have held for years.
• It shows up everywhere in investing: refusing to sell stocks you would never buy today, clinging to inherited or childhood stocks, hoarding company shares, and holding your “best picks” long past their prime.
• The “would I buy this today?” test is the single most powerful tool to combat the endowment effect. If you would not buy a stock at its current price with fresh cash, you should not be holding it.
• The endowment effect connects to other biases – loss aversion, status quo bias, sunk cost fallacy, and the disposition effect – creating a web of psychological forces that keep you trapped in suboptimal positions.
• XEQT structurally eliminates the endowment effect by removing individual stock attachment, automating rebalancing, and offering perfectly fungible shares with no emotional stories attached.
• “I’ve held it for years” is not a reason to keep holding. Time is not a thesis. The market does not reward loyalty.
• Practical strategies include the clean slate thought experiment, systematic selling rules, gradual transitions, and automation.
• The ultimate freedom is owning a portfolio where no single holding is special – where the endowment effect has nothing to work with and your emotions cannot sabotage your returns.

Stop overvaluing what you own. Start investing in what actually makes sense.