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24 questions
Why is paying off an overdraft often better than investing?
Because the interest you save is a guaranteed, tax-free return, while an investment only offers an uncertain one.
What is the emergency fund technically there for?
So that unexpected expenses never force you to sell your investments at a bad time.
Which shapes your result more over many years: the savings rate or which securities you pick?
As a rule, the savings rate.
Is the emergency fund sized to your income or your expenses?
Your expenses. What matters is how long you could live without new income coming in.
Why doesn't a broad stock ETF work as an emergency fund?
Because while it can be sold, its value at the moment you need it can be unknown. That moment of need often coincides with bad market conditions.
What does the emergency fund cost you?
The forgone return. That's the premium for never having to sell at the wrong moment.
Why can't a debt payoff's return be compared directly to an investment return?
Because it's guaranteed and tax-free, while an investment return is uncertain and taxable.
What gross return would an investment need to beat an 8 percent loan?
At roughly 26 percent tax on investment income, about 10.8 percent, and guaranteed at that.
Highest interest rate first, or smallest debt first?
Highest rate is mathematically cheaper; smallest debt gets followed through more often. The difference in outcome is usually small.
Which variable in a savings plan can you reliably control?
The savings rate. The return you can only estimate, not determine.
Why do many people miscalculate their expenses?
Because annual items like insurance, vacations, and repairs don't show up in monthly thinking.
Why does a standing order right after payday work so well?
Because whatever's available gets spent. What leaves first is never available in the first place.
Why is insurance rational even though it costs money on average?
Because it prevents a state with no recovery. For existential risks, avoiding ruin matters more than expected value.
What kind of damage shouldn't you insure?
Whatever you could pay for out of your emergency fund.
What's the problem with products that combine insurance and investing?
Both parts become incomparable, hard to switch, and opaque in their costs.
Why does the probability of a loss fall with a longer holding period?
Because expected return grows linearly with time, while volatility only grows with the square root of time.
Does that mean stocks become safe after ten years?
No. There have historically been decades with a negative real result. A long horizon only lowers the pressure to sell at a low.
What determines your equity allocation?
The sum of your goals with a long time horizon, not a general recommendation.
What's the difference between risk capacity and risk tolerance?
Capacity is objective and depends on income, wealth, and time. Tolerance is emotional resilience. The lower value governs.
Why is a risk questionnaire unreliable during good market times?
Because stated tolerance is strongly influenced by recent market performance.
What magnitude of decline should you plan for in broad stock markets?
Historically, declines of roughly 40 to 55 percent have occurred more than once, with recoveries spanning several years.
Roughly what does a year of waiting cost, and what can it earn instead?
It costs a year's expected return. Paying down expensive debt in parallel delivers a guaranteed saving, usually larger.
Why is an early exit so damaging?
A realized loss right at the start raises the odds of quitting for good and never coming back.
Why is investing on borrowed money especially dangerous?
Because the repayment obligation is tied to a market value you don't control. That's what produces forced sales.