Some days ago, I went to a local sporting goods store to buy swimming trunks. The store was part of a large international chain famous for its reasonable prices and acceptable quality of products.
When I entered the store, I spotted a big billboard with large words in blue and orange. It offered me and other visitors to take an orange shopping cart if I needed assistance and a blue one if I preferred to be left alone.
There was a cart collection area right under the billboard.
I thought it was a clever idea. My wife likes to talk to an assistant and get help while choosing the goods. So, she'd opted for the orange cart. But gloomy, unsociable types like me prefer to wander between the shelves in silence and solitude, so the blue cart would be my choice.
I mentally applauded the marketers of the chain. Great job, I thought.
And only then did I notice that there were only blue carts under the billboard. The orange ones were missing for unknown reasons.