Share 'Ethics of mystery shopping'

Any businessman will tell you that knowing how your competitors sell their wares and at what prices is simply good business practice. But how do you get this information? Is it Ok to do mystery shopping? As in all other aspects of business, while (most times) there is clarity on what  is legal and what is not, there is a lot of ambiguity on what is ethical and what is not. My friend owns a clothe…