What is the ratio of corporate mergers vs. corporate divisions?

[Norteamericano H]

It seems like every year some company or corporation or firm mergers with another one. But how many corporations do the opposite, that is, disintegrate during one year? What is the ration between corporate mergers and corporate divisions? And what is a long-term tendency? Is it towards more and more concentration and centralization of the economy? If so, could this tendency lead to a situation where there will be only a few (or even only one) company left in each industry and later, perhaps, one company controlling the whole economy? ------

[Laura Beth]

Poop. I wish I new. Hope you find your answer! ------