Some people say that the rules of the economic field and the moral field are different. The economic field emphasizes the role of "economic man" and the principle of doing more and more profit; while the moral field requires dedication, altruism, mutual assistance, etc. It is true that there are rules of supply and demand signals, equivalent exchange, clear property rights, and profit maximization in the economic field, but since it is a social activity of people, moral principles will also penetrate into it every moment, and it is difficult to clearly separate the two. What does this passage mean? ['The role of ethics in the market economy is inevitable.', 'Sociality is a common attribute of the economic and moral fields.', 'Values of various fields in social activities are infiltrating.', 'Need to balance economic and moral principles in social activities.']