This paper examines why pension plans increased their liabflities by giving benefit increases to persons no longer working even though almost al lof them were not required to do so by any legally enforceable contract. In our model workers and firms have implicit contracts under which...

Many firms give post-retirement increases in pension benefits to retirees even though the pension contract does not require such increases. A leading explanation of this behavior is that benefit increases are part of an implicit contract where retirees accept lower initial benefits in return for...