Retailers that fall into bankruptcy wind up liquidated almost three times more often than other companies as shopping’s waning popularity and tougher competition make turnarounds harder to execute, Fitch Ratings said. That’s the conclusion of the credit-grading firm after studying 30 recent retail bankruptcies that involved $10.5 billion of debt. Fifty percent didn’t survive the process, compared with 17 percent across other industries, Fitch said in a 114-page study released Wednesday.