I love a good shopping cart. (If we’re friends on Facebook, you probably already knew that.) Not long ago I was in a retail store during a very busy season. I grabbed the last cart available only to discover that it pulled hard to the left. Additionally, it had a wheel that thrummed and clicked at a rhythm consistent with my pace. Left un-corrected the cart would veer hard left and crash into people and displays causing damage. The thumping wheel made using the cart for its intended purpose nearly impossible. What is typically a fun experience was spoiled by…