Your comment reminds me of a story 3 - 4 years ago where there was a bad coffee bean harvest and the price of beans went up. The coffee shops immediately increased their prices, pointing to the increase cost of coffee beans. 

A year or so later, harvests returned to normal and the price of coffee beans went down. Some enterprising journalist went and asked why the price of coffee hadn't come down. The response was that, "Oh, well the price of coffee beans is a small part of our overall costs ..."

Another coffee shop story. We had the TFW program about 3 years ago and companies (including coffee shops) were bringing in TFW as there was 'a shortage of Canadians qualified to work in coffee shops'. The program allowed companies to pay up to 10% less to the TFW's. Oddly enough, I never saw the price of a cup of coffee go down though in any place that might have been using TFW's.