Why might the immigration agent be interested in who paid for an immigrants passage and how much money the immigrant had?

The Immigration agent may be interested in who paid for the immigrant's passage and their financial resources to assess the immigrant's economic stability and potential reliance on social services. Understanding the source of funding can help determine if the immigrant is entering the country for legitimate reasons or if they're being trafficked or exploited. Additionally, it provides insight into the immigrant's ability to support themselves and integrate into the community, which is crucial for evaluating their visa application or residency status.