Grocery stores were an enormous business before Walmart, it just made them more efficient. And it opened doors for lots of smaller products to reach far more cu

Grocery stores were an enormous business before Walmart, it just made them more efficient. And it opened doors for lots of smaller products to reach far more customers. The entire mobile app market was not even one hundredth the size of the App Store before it was created. The walled garden Apple created made safest and easiest app purchase environment ever, which is why it attracts the highest spending by app customers and highest spending app customers. If Apple had taken the Google play route that $35B a year would be closer to $4B a year.