Ryufin Learn

Short drawn lessons on money, investing and a clear mind. Every lesson also has its own page with the full text.

Thinking clearly

The traps that catch smart people with money.

  1. The planes that came back
  2. Why losing hurts twice
  3. The number that sticks
  4. Why the best do worse next year
  5. The more they traded

How money grows

Compounding, costs, and why time does the work.

  1. The rule of 72
  2. The quiet shrink
  3. Ten years that beat thirty
  4. The 1% that takes a third
  5. All at once, or bit by bit?
  6. The price of admission
  7. The needle and the haystack

Index funds, simply

What you actually own when you buy the whole market, and why cheap tends to win.

  1. What an index really is
  2. The fund they laughed at
  3. ETF or fund?

How to value a stock

One number at a time, on one small lemonade company. Then all of them together.

  1. Price is what you pay
  2. The P/E ratio
  3. EV/EBIT: the whole business
  4. Free cash flow
  5. Return on capital
  6. Margins
  7. How much debt is too much?
  8. What is already in the price
  9. Buybacks and dilution
  10. Which way is better?
  11. Compared to what?
  12. Putting it all together

Inside the reports

The three statements every company publishes, taken line by line with Lemon Co.

  1. The income statement
  2. The balance sheet
  3. The cash flow statement
  4. Where the reports live
  5. Five warning signs

Clues in the filings

Big customers, insider trades, short sellers, fund holdings and a distress score: what each one can and cannot tell you.

  1. When one customer is the business
  2. When insiders buy
  3. The bet against
  4. Who else owns it
  5. Distress in one number

A clear mind

The voice in your head, and small tools from studies that quiet it. Most of them take a minute.

  1. Alone with your thoughts
  2. Don’t think of a white bear
  3. A thought is not a fact
  4. Name it to tame it
  5. Talk to yourself by name
  6. Breathe out longer
  7. Out of your head, onto the page
  8. A walk among trees
  9. Come back, again
  10. When the voice gets loud

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