WHEN IT COMES TO financial questions, there are two common reasons people disagree. Sometimes, they disagree about the facts—whether, say, interest rates are headed higher. But sometimes, people disagree for another reason: They see the world through different lenses.

Last week, I mentioned that Ray Dalio, a prominent hedge fund manager, had recently said that bonds “have become stupid.” I disagreed, but not because of the facts. There’s no disputing the impact of today’s low rates.