It is no secret that most Americans are not saving enough. Experts usually cite lack of financial knowledge and poor decisions as the main culprits. But what makes even people who should know better make these mistakes? The answer is emotional blind spots, according to the book, The Dumb Things Smart People Do With Their Money: Thirteen Ways to Right Your Financial Wrongs. The author is Jill Schlesinger, a former Wall Street trader who is now a financial advisor and CBS News business analyst. She explained how emotional decision-making can devastate portfolios in an interview with Knowledge at Wharton radio show on SiriusXM . (Listen to the podcast at the top of this page).  An edited transcript of the conversation follows. Knowledge at Wharton: In the book, you give the example of a smart friend of yours who was successful in business but made mistakes in his personal finances. Do you think that’s a common problem? Jill Schlesinger: Absolutely, we find it over and over. I have a weird career.…