LABOR

Caterpillar to Implement Contract Offer: Caterpillar Inc. said negotiations with its unionized workers reached an impasse, and it will impose most of the terms of its latest contract offer effective Dec. 1. Gerald Flaherty, president of the heavy equipment manufacturer, said the company remains willing and interested in negotiating a signed contract agreement with the United Auto Workers but that no break in the deadlock appears likely. Caterpillar’s new contract will change some health benefits and also limit benefits to retirees, among other provisions.