What is a reasonable finders fee?

As an investor or a party seeking financial assistance, the question of what constitutes a reasonable finders fee often arises. Can you explain what a finders fee entails, and how one can determine if it's fair and reasonable? Are there any industry standards or benchmarks that can be used as a reference? Additionally, what factors should be considered when negotiating a finders fee to ensure it aligns with the value provided by the finder and the risks involved in the transaction?