Costco free samples aren’t just free food. They’re a strategy. We went inside to investigate who’s REALLY, and the psychology they use to get you to buy. Do they care if you purchase the product? Are ...

Add Yahoo as a preferred source to see more of our stories on Google. A woman offers a sample at a Costco store - Tim Boyle/Getty Images If the best things in life are free, then a trip to Costco can ...