Brian wants to know what would’ve happened if he’d selected different bid amounts in his Shopping campaign. He should:
set up enhanced cost-per-click (ECPC) bidding
customize the statistics tables in the Campaign tab
use the priority setting in his Shopping campaign
use the Bid Simulator
Adword’s bid simulator will allow you to know what’s changes gonna exist in your advertising campaign if you change a certain factors in your campaign.
Using this tool will provide you with Potential CPC amounts from a certain amount of bids.
The regular Bid Simulators show you how changes to your max. CPC bid might change the cost or the number of clicks, impressions, conversions, and conversion value your ads would have received for your keyword or ad group. You can find them on the Ad groups and Keywords tabs.
Read more here: https://support.google.com/adwords/answer/2470105