There seems to be no end to the damage caused by investment fraud.

Ebata: "A fairly effective means of preventing investment fraud is the 'equi-proportional series,' which you should have learned in high school."

Daughter: "I don't remember that."

Ebata: "'Exponential function' would be fine."

(I just realized that probability, expected value, and standard deviation are more valid for investment fraud.)

Wife: "I don't think most people realize that it's 'tied to an investment scam.'"

Ebata: "Yes. That's why I've been saying for a long, long time, 'If you use the examples from the investment seminar to teach equi-proportional series and exponential functions, you kill two birds with one stone' in math class--is the MEXT stupid?"

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My whole family shouted "You're right!"

Well, I know I am not proper to talk about this, as I have been a victim of fraud before.