Ryufin Learn

Short drawn lessons you swipe through, a few a day. This page needs JavaScript to draw them.

Thinking clearly

The planes that came back (survivorship bias). Why losing hurts twice (loss aversion). The number that sticks (anchoring). Why the best do worse next year (regression to the mean). The more they traded (overconfidence).

How money grows

The rule of 72. The quiet shrink (inflation). Ten years that beat thirty (starting early). The 1% that takes a third. All at once, or bit by bit. The price of admission (market falls). The needle and the haystack.

Index funds, simply

What an index really is. The fund they laughed at (the first index fund and Buffett's bet). ETF or fund?

How to value a stock

Price is what you pay. The P/E ratio. EV/EBIT. Free cash flow. Return on capital. Margins. How much debt is too much. What is already in the price. Buybacks and dilution. Which way is better? Compared to what? Putting it all together.

Reading the reports

The income statement. The balance sheet. The cash flow statement. Where the reports live (10-K, 10-Q, 8-K). Five warning signs.

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