Is voluntary exchange moral?

As a finance professional, I often ponder the question of whether voluntary exchange is truly moral. On one hand, it seems to be a fundamental principle of economics that people should be free to engage in transactions of their own choosing, as long as they are done willingly and without coercion. However, could there be instances where voluntary exchange may not align with ethical principles? For example, if a person is exploiting someone else's lack of knowledge or resources in a transaction, can it still be considered moral? Or, are there certain goods or services that should not be exchanged, regardless of whether the participants are willing? I would be interested to hear your thoughts on the matter, as it is a complex and nuanced issue that requires careful consideration.