How many people are required to have a valid argument?

A valid argument requires at least two people because an argument fundamentally involves the presentation of a claim and counterclaim. One person can articulate a viewpoint or assertion, but to establish an argument, there must be another individual to provide a response, critique, or alternative perspective to that assertion. This interaction between differing viewpoints is what qualifies a scenario as an argument.

In contexts such as debates or discussions, the exchange of ideas between at least two parties allows for the examination of the validity and strength of the claims being made. Even a dialogue between two people can illustrate how one person's stance can be challenged, leading to a deeper exploration of the topic being discussed. This dynamic interaction is essential for a comprehensive understanding and evaluation of the points made. Consequently, having two people engaged in such a discourse is crucial for substantiating an argument.