Mary Hall is a editor for Investopedia's Advisor Insights, in addition to being the editor of several books and doctoral papers. Mary received her bachelor's in English from Kent State University with ...

A customer normally buys a cup of coffee and one doughnut on the way to work in the morning. However, for one day only, the coffee shop has dropped the price of doughnuts by 30 percent. The customer ...

Investopedia contributors come from a range of backgrounds, and over 25 years there have been thousands of expert writers and editors who have contributed. Somer G. Anderson is CPA, doctor of ...