Many of these are commercial: What shampoo to pick? How much to spend on a bottle of wine? Whether to renew a subscription?

These choices might appear to be freely made, but psychologists have shown that subtle changes in the way products are positioned, promoted and marketed can radically alter how customers behave.

The Illusion of Choice identifies the 16½ most important psychological biases that everyone in business needs to be aware of today – and shows how any business can take advantage of these quirks to win customers, retain customers and sell more.