Oliver Haslam has been writing about phones, computers, games, and anything else that takes a battery or plugs in for more than he'd like to admit. With a focus on mobile and laptops, Oliver is never ...

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Investopedia contributors come from a range of backgrounds, and over 25 years there have been thousands of expert writers and editors who have contributed. Profit margin and markup are accounting ...

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 ...