Clark recently told you how Wal-Mart ranked as the worst retailer and the worst grocer when it comes to customer satisfaction, according to the latest ACSI survey. The irony is that people still shop there in huge numbers despite all the complaints. But that may not always be the case.

Before Wal-Mart was the largest retailer in the world, that title was held by Sears and then by Kmart. Both Sears and Kmart are today owned by Sears Holdings, which has now reported that its profits are down by nearly 50%. Sears Holdings' sales are declining rapidly, while cash on hand has dropped from $4 billion a year ago to $1.5 billion now. The marketplace spoke and this is the result.

The Wal-Mart haters have to realize that the marketplace will speak again if Wal-Mart doesn't improve its customer experience. Look at any industry. In the car field, GM used to own this country. Today, they're struggling to survive because they had a tin ear to the customer. The message is clear: If somebody doesn't take care of you, you must use your feet and take care of yourself by taking your business elsewhere.