To get legal income earned from sources other than work under the protection of law, three issues must be properly resolved; first, to define the nature of income, legal or illegal, in terms of law;

要让合法的非劳动收入受到保护，关键要解决好三个问题：一是从法律上界定收入的合法与非法；

youdao

When someone is too deeply in debt, he may have little incentive to work, or, at least, to do work that is legal, as any income earned will have to go to creditors.

ECONOMIST: America goes bust