Non-communicable diseases (NCDs) cause about 71% of all deaths globally and a considerable increase in health care costs. To tackle this problem, several Governments have designed "sin taxes", i.e, extra payments related to the quantity of unhealthy contents of specific goods. However, unhealthy...

With few exceptions, today's retailers sell products across multiple categories. One strategic consideration of such retailers is product location, which determines how easy or difficult different categories are for customers to access. For example, grocery or department stores determine which...