New research in the Journal of Personal Finance shows why retirees can spend 20% more in early retirement than the 4% rule allows. In our latest research roundup, we also highlight research on aging, the demographic aspects of investment mistakes and Social Security claiming.

At the Financial Planning Association's Business and Education Conference in Boston last weekend, Bill Reichenstein talked about tax-efficient withdrawal strategies, Steve Deschenes made a case for income-oriented American Funds, and David Blanchett explained that retirement might cost less than expected.

Safe spending rates range from 2% to 10%, writes researcher Luke Delorme in the Journal of Financial Planning. It all depends on when people retire, how much guaranteed income they have, whether they want to leave a legacy, etc. One size never fits all.