Yoran Brondsema

The through-line

Across nearly every post, Brondsema returns to one idea: the hard part of passive investing is not the strategy itself but sticking to it. He frames "hangmatbeleggen" (hammock investing) as simple in theory and difficult in practice, and his writing has shifted from explaining the basic case for index investing toward dismantling the objections and behavioral traps that make people abandon it: market timing, panic selling, unclear diversification, tax confusion, and the false comfort of a savings account. The second book, "Hangmatbelegger voor het leven," makes this shift explicit: "Het basisthema van het boek is: volhouden is een stuk moeilijker dan beginnen met beleggen" [5], echoed almost verbatim in his description of the podcast conversation about the same struggle [3]. The recurring subtext is that most financial mistakes are not calculation errors but behavioral ones, discovered too late, as in Christiane's story: "Christiane heeft niets fout gedaan. Ze kwam het alleen te laat te weten" [6].

On volhouden (staying the course)

Brondsema treats persistence, not cleverness, as the deciding factor in investment outcomes. He repeatedly shows that investors in identical products end up with wildly different results purely because of behavior: "Twee groepen beleggers zaten in exact hetzelfde fonds. De ene groep haalde 7,7% per jaar, de andere 4,3%" [11], with the better outcome explained simply by the fact that they "bleven storten tijdens de daling" [11]. He is skeptical of market timing on principle: "Je moet niet één keer gelijk hebben, maar twee keer na elkaar: op tijd verkopen én op tijd terugkomen" [4], and points out that "elk jaar dat de beurs stijgt, wordt die drempel hoger en het scenario onwaarschijnlijker" [4]. Even the amount saved matters less than when the habit of saving more begins, as in his comparison of two savers: "Robert en Ilse begonnen allebei op hun 25ste met €200 per maand beleggen. Op hun 65ste heeft Ilse €186.000 meer, en dat komt niet doordat ze slimmer belegde" [13].

On spreiding (diversification)

He pushes back on the instinct to add funds in the name of safety, arguing that apparent diversification can secretly be concentration. Buying a world ETF plus an S&P 500 and a Nasdaq-100 tracker feels safer but isn't: "Je portefeuille oogt uitgebreider, terwijl ze geconcentreerder is geworden" [7]. His conclusion is that "spreiding zit in wat er achter je posities schuilt" [7], not in the number of line items on a statement. The same logic applies to filtered products like halal ETFs, where he is explicit about the tradeoff: "Wat je opgeeft is spreiding, niet de lage kosten van indexbeleggen" [9].

On pensioenopbouw (building your own pension)

Brondsema treats the statutory pension as insufficient and largely outside individual control, which is precisely why he automates the part he can control. He lays out the numbers by employment status, noting "een zelfstandige zit gemiddeld onder de armoedegrens. Ik ben er zelf een, dus dat cijfer kwam even binnen" [12], and draws the practical conclusion: "Dat is de reden waarom ik al jaren elke maand automatisch beleg. Omdat dat het enige stuk is dat ik zelf in handen heb" [12]. He frames checking the three pension pillars as a basic, non-optional exercise, using Christiane's story as a cautionary tale about learning this too late [6], and treats products like pensioensparen or tak-21 as often underperforming a globally diversified alternative by hundreds of thousands of euros over a working life [15].

On controle (children and money)

When it comes to investing for his daughter, Brondsema frames the choice as one about control, not returns. Investing in a child's name transfers legal ownership at eighteen, which he sees as a real tradeoff rather than a default good: "Alleen verlies je de controle. Vanaf zijn achttiende beslist je kind, en jij niet meer" [2]. His own choice is to keep the money in his own portfolio with a separate monthly contribution earmarked for her, which lets him decide when the money is handed over: "Maar tot dan beslis jij wanneer dat geld iets betekent" [2].

From the stage

In interviews he adds context absent from the written posts: that the first book came about because a publisher discovered his startup Curvo and approached him, and that he chose to co-author with Tim specifically to avoid two similar books competing in the small Dutch-language market [16]. He also describes Curvo's backtesting tool, using historical data to show investors the returns and volatility to expect from different portfolios [18], and gives a personal detail on his own working rhythm as an entrepreneur pursuing passive strategies, saying he works roughly one day per week [18]. He also traces his path from studying computer science and embedded systems to co-founding the online education platform Sutori before building Curvo [18].

Takeaways

• Keep your emergency buffer in a reglemented Belgian savings account rather than invested; at 1.5% interest you can hold about €68,000 before triggering tax on the interest [1].
• If investing for a child, consider keeping the portfolio in your own name with a separate monthly contribution so you retain control past their eighteenth birthday [2].
• Don't try to time the market: you need to be right twice, both on the exit and the re-entry, and each rising year makes the "crash is coming" scenario statistically less likely [4].
• Use mypension.be and an online simulator to add up your three pension pillars before assuming your statutory pension plus pensioensparen will be enough [6].
• Adding more ETFs that hold the same top companies (Apple, Microsoft, Nvidia) can make a portfolio look more diversified while actually concentrating it further [7].
• Automating contributions, as in pension-account investors versus self-directed investors in the same Vanguard fund, converts a 4.3% behavior-driven return into a 7.7% one over the same period [11].