[vladms]

I am not that sure it was the case before either. If you have 40 very similar products at Walmart where are they placed? Which one is placed on the top shelf (less visible) which one is placed at average height? How many packages of 1 type of product you have (you can have 10 of 1 product and 1 of another product - which one will be seen first). And so on.

Yes, you can do even more with an online market, but that in my opinion is "do similar things, only faster and more dynamic". Moving products from bottom shelf to middle shelf in all supermarkets = probably 1 week planning/executing. Moving all apps from first page to 3rd search page = probably 5 minutes.