In the case where you have to target a kw which have a very high in competition and also very big bidders are bidding. What will be your strategy for running an ad campaign for this keyword?
I will definitely try to run small campaign or just divide a large campaign in many small divisions first. That will be the first step to take. And there are many factors effecting these things so I have to determine by judging the situation.
First things first. You don't go after a highly competitive keywords with very high bidders unless you have a lot of budget too. Its just an unwise thing to do.
I just wrote about a situation that can happen. It doesn't mean that I am foolish enough to go after it.