Psychology has as much usefulness in retail as it does in criminology and in psychiatry. The customer, for instance, can be profiled through various techniques so that retailers can know how to treat them after-sales. Psychology, in other words, is important in direct mail marketing by simply identifying customer behavior allowing retailers to customize their after-sales offers appropriately.

Of course, psychology drives a big part of product packaging particularly in conceptualization and design. Remember, your product packaging is the final step in your advertising efforts. Coming up with a very effective product package design is crucial and can make or break your sales figures.

Here are four hacks that psychology says are effective when implemented in product packaging.