User blog comment:ClariS/The Fallacies of Item Efficiency/@comment-5969046-20130302110936

"Gold efficiency of an item" x "Weight coefficient related to the importance of each stat in your build" = "In game efficiency" then ?

For instance, Holy Grail on Darius.

Gold efficiency : 105-110 % / Weight coefficient for these stats on Darius : 20 % (to be detailed for each stat).

Total item efficiency for gold invested : 105-110% * 20% = 21-22% (dont buy it).