Book (Practical) Politics, economy and society A story about a monthly income of 500000 yen with a stock for toilet break

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Economics
It is impossible for a salaried worker to buy or sell something like a day-care while at work. However, when I tried to do it with a little break time in the bathroom, my monthly income exceeded 500000 yen. That increased six times in a year and a half. "We don't check the close price at 9 am," "We don't look at the rough market," and "Only stocks with a market capitalization of 500 billion or more in Higashi-1." All necessary things are disclosed.