Book (Practical) Politics, economy and society Rule change for money that has increased the number of wallets from just salarymen to 18

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Politics, Economy and Society
When the economy is on the decline, the biggest risk is that "wallets = only company salaries". And if you are only employed, your income will not increase. From "Network 0" and "Knowledge 0", the author who realized a life in which people in their 30 s travel the world looking for 18 wallets, an annual income of 100 million, and investment projects by increasing non-company wallets (income sources) one by one, teaches how to increase wallets one by one.