This article, about insurance coverage for contingent business interruption losses caused by Hurricane Isaac, quotes insurance partner David Klein.
Klein states that, "What everyone thinks about first is direct damage to their property, but that's only the most obvious thing. There are also economic impacts, and the biggest impact will be business interruption for companies. ... Oftentimes, the lost profit is a lot bigger than the direct property damage."
He continued on to describe why companies have difficulty proving business interruption losses, stating, "There's always room to disagree about what business would have been done but for the interruption. That's affected by economic cycles, affected by seasonal changes. It's affected by changes in the business itself."