ZEDO’s Ad serving algorithm is designed to first serve ads from a higher level and then look at the lower level ads and serve them.
 
Auto Optimization works within levels to ensure that the best performing ad within a level gets the highest weight and  serves it at a higher ratio than the other ads in the same level. 
 
Auto Levelling places the best ad on a higher level than the lesser performing ads. It ensures that the best ad finishes serving before moving on to the next best ad. 
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