In a family, even if only one is earning money, what the others do (such as a wife doing housework, child studying) is also a form of cooperation to maximize wealth.

• 在婚姻家庭中，即使只有一个人从社会上获得收入，其他人所做的一切（妻子操持家务，孩子认真读书），也是共同谋求最大化财富的合作模式。