If you have to interview a business person, talk politics with them.
If I could pick any one interview question for hiring a business person, I would ask them to talk about the conflict in the Middle East. What's their perspective? Do they take a stance? Do they try to argue something that they have no education on? What do they think of the supposed "enemy? And the most important part of this question: Do they even consider the other side's perspective?
You'd be surprised, because many people don't. Especially here at Berkeley. The debates between two sides of an issue aren't because our students are open-minded, but rather because there's diversity. With so many college-aged students on a single campus, it just so happens that there are multiple sides of the debate. But it doesn't make any of them open-minded, educated, or enlightened in any way. You're also probably thinking, "Isn't a political discussion a good way to end a friendship?" My answer is absolutely, and that's why I think it would make for an excellent interview question. Even if the candidate was a Zionist Jew, I would argue the Palestinian perspective just to put their pride in check.
I first thought about this when I was in a model United Nations session. I was watching my colleagues representing other nations debate among each other, argue about issues without a goal and without a premise. Had they never learned the tactics from "How to Win Friends and Influence People"? I saw from a first-hand perspective why the UN doesn't seem to get anything done. People leave just as ignorant or educated as they were coming into the assembly. People argue their stances, boost their egos, claim victory, and do very little to actually help the situation. And it's ironic too, because everyone coming into the model UN wonders why nothing useful ever gets done.
Which makes me think that it's not so much an issue about policies and actions... it's about the method by which we negotiate and resolve conflict with each other. The most important part of this being, "does the other side even attempt to listen to and understand my perspective?" Have you ever been in a situation where two people were in a political debate, and you could tell that the person who wasn't talking was only thinking about what they would say next in rebuttal? It's good entertainment, but no conflict resolution. This directly applies to the business world - if you're negotiating something, even as simple as an employee's salary, can you think about the other person's feelings, needs, and concerns?
I'm not saying that talking politics is the best way to see if a candidate is any good, but I do think that it's a great way to screen out people who aren't open to learning and listening. I've started to run this test on friends too, because it tells me how good of a listener they are, and how much they care to understand alternative perspectives. Business gets very personal very fast, so put your people to the test before you bring them on your ship.