My first analysis actually happened before I build the platform. I was manually comparing prices of products the stores themselves offer in the lowest price segment. Things like grocer store brand milk or flour.
I compared 40 product pairs across the two biggest chains. And lo and behold: their prices matched exactly to the cent!
An NGO picked this up on Twitter and did the analysis for 600 product pairs. Same picture.
With my platform in place, I could do more advanced stuff.