“Owing to a debtor’s ability to reject contracts of nearly all types, a bankrupt company is frequently in a position to become a low-cost competitor in its industry upon reorganization. Unprofitable, high-cost facilities are closed or sold, above-market lease costs are reduced to market levels, and a company’s overstated assets are typically written down on its books to fair-market value, thereby reducing future depreciation charges. The bankruptcy process can sometimes serve as a salutary catharsis, allowing troubled firms the opportunity to improve their business operations.”