How can AdWords Campaign Manager possibly adjust so many individual unique keyword bids in just one operation?”
A. What’s impossible for a human to do manually is often possible by computer. It’s actually not that difficult for software to change unique maximum CPC bids simultaneously. Without giving away the secrets of AdWords Campaign Manager’s algorithms, this is the principle of how it’s done. You give each individual keyword a “weight”, plus or minus, for its competitiveness, compared to your main keyword. This is done only once, because each keyword’s importance, RELATIVE to another’s, is unlikely to change over time, even if its ACTUAL value does. (For a complete explanation of how to determine what this “weight” should be and how to do it, see the ‘Hints’ form in the ACM software interface.) The “weight” can be an absolute cash amount or a percentage. AdWords Campaign Manager uses the “weight” of each keyword to calculate and recalculate the maximum CPC bid amount for every keyword phrase permutation containing the individual keywords whenever you change the single ‘Base bid amount’ valu
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