Mary Anne and I weren't always married, though it seems like it after 20+ years. I still had a lot to learn about women when she and I first got married. One of those things I had to learn was how women had an entirely different methodology for shopping than men.
I found it best to think about it in terms of our hunter-gatherer ancestry. Men were the hunters; the first thing we saw that could provide the necessary meat for the tribe was the first thing we stabbed to death and brought home. We knew the general locations where those meals on legs could be found, so we just went there, waited for them to show up, go Stone Age on their asses, and then, VOILA, lunchtime.
Men today shop the same way, except huge discount stores make it so much easier to spot that button-down oxford shirt, sneak up on it, spear it, and drag it back to our caves.
Women? That's a whole different game. One that men will never understand, except to note it somehow evolved from jabbering at each other while wandering among groves of fruit trees.
As an example of what happens when these worlds collide, I present an account of my first married shopping trip with Mary Anne: