Comment by hinkley

Motivations can vary on a diurnal basis too. Or based on location. It means something different if I’m using homedepot.com at home or standing in an aisle at the store.

And with physical retailers with online catalogs, an online sale of one item may cannibalize an in-store purchase of not only that item but three other incidental purchases.

But at the end of the day your 60/40 example is just another way of saying: you don’t try to compare two fractions with a different denominator. It’s a rookie mistake.