http://www.newwebsitemarketing.com/small-business-advice/four-tips-for-boosting-your-profits-with-business-cards A business card may be the most overlooked advertising medium in the business world. But these simple rectangles of cardboard can be powerful tools to help any entrepreneur increase sales. Similarly, a poorly thought out or clumsily designed business card could be as much of a detriment for your sales as an âout of businessâ sign.