Each group needs money and is working hard for its own piece of the pie.
Etymology: based on the idea that something whole is like a pie (= a round, filled pastry) that can be divided
piece of the pie
A share or part of something. The business owner wanted all of his employees to have a piece of the pie, so he gave them all stock in the company as a holiday bonus.
a piece (or slice) of the pie
a share in an amount of money or business regarded as something to be divided up.