My grocery store, which is a less-than-10-minute drive with almost no traffic, sells several types of kitty litter. Many are name brands. Some are low-cost store brands. There are at least two different sizes of bags. Yet I will drive all the way across town, through a ton of traffic on a stoplight-riddled road, just to buy one specific brand of kitty litter.  Why? Because I’m loyal to that brand. I believe in the company’s mission. I believe in the product. They also email me coupons and respond to my tweets. So I make an extra effort to purchase their product. So, what makes a customer loyal to a particular…