You’re walking the aisles of your local grocery store, picking out fresh ingredients for dinner — you get to the counter, pay for it, bag it, and you’re off. Pretty simple, right? Well, that little mindless exchange was the product of thousands of years of human development. There was a time, not that long ago, when acquiring what you needed to survive entailed far more individual effort. This week on Sea Change Radio, we speak to Kevin Walker about his new book, The Grand Food Bargain, to learn about the ups and downs of all this food abundance.