Everyone wants to talk about the perfect investment. Almost nobody wants to talk about the boring emergency fund. That's backwards.
The real purpose
An emergency fund isn't an investment. It's insurance. Its whole job is to make sure that when the water heater dies or you lose a week of work, you don't have to sell your investments at a bad time — or, worse, put it on a 20% credit card.
How much
Start small. One month of expenses is a real win. Two to three months is comfortable. Aim for 3-6 months eventually, but don't let the perfect be the enemy of starting with $500.
Where to keep it
Not in stocks. It needs to be liquid and stable — a high-yield savings account or money market fund. Boring is the point. You're not trying to grow it, you're trying to keep it available.
The compounding argument
Keeping a buffer means your long-term investments can actually stay invested through crashes. The people who panic-sell in a downturn are disproportionately the ones with no cash cushion.
I summarized the basics of emergency funds, index investing and ~40 other personal-finance books into one-page notes at RichReadme.
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