This is a common situation and the most direct response is to bid on your own brand name so your ad shows up above theirs. Your quality score for your own brand name will naturally be higher, which means you will pay less per click and still rank above competitors. Some marketers also write ad copy that highlights what makes them the original or the better choice. Taking legal action is possible in some cases where the competitor is misleading users, but that is a longer route. The best immediate step is to protect your brand by bidding on it yourself. So what do you think is the most effective way to defend a brand against competitor bidding?