I’m not sure it’s a complete aside. What you’re describing is the general recipe that business school warns against for entrenched industries. That is to say, i

I’m not sure it’s a complete aside. What you’re describing is the general recipe that business school warns against for entrenched industries. That is to say, if you give up low margin products, you give an inroad for competitors to gain competancy and scale. Rebar in the steel industry is sort of the hallmark example. Even though search is still an important part of their ad income, I don’t see google’s dominance in search lasting another 100 years, since there will continue to be smaller competitors who excell in some small low margin area and it will slowly chip away at their brand.