I can see why walmart would want to invest in startups as opposed to purchasing them when they are worth billions. But why silicon valley I wonder? There is a c

I can see why walmart would want to invest in startups as opposed to purchasing them when they are worth billions. But why silicon valley I wonder? There is a competition there already. I am also surprised stores like Walgreens have been fairly inactive in trying to keep up with tech. Even simple stuff like their photo apps so you can print stuff in their store could use some upgrades.