·         The minimum needed to hold your ad position, under the maximum cost–per–click (max. CPC) limit
·         The minimum needed to hold your ad position, but never less than 50% of your maximum cost–per–click (max. CPC) bid
·         The minimum needed to hold your ad position, but never more than 120% of your maximum cost–per–click (max. CPC) bid
·         The minimum needed to hold your ad position or 50% of your maximum cost–per–click (max. CPC) bid, whichever is greater