WHY IS THE COST CENTERS, PROFIT CENTERS AND INVESTMENT CENTERS HAVE HAD THEIR OWN BUDGET?

Why do not price centers, distinction centers as well as investment centers had their own budget? What each manager? Can we give an e.g. of the kind of decisions in which a single more research danschaque core would be used? This is an accounting course, though I do not ask to use your answers, I need to begin usually a single place to answer these questions. If any sites which share the answers to these questions to find please. Pour votre help Thank you.