The state needs to give public schools a larger 'piece of the pie'. [=the state needs to give public schools more funds]
He's the best player on the team and he wants a bigger 'slice of the pie'. [=he wants more money]
His plan to reduce the national debt seems like 'pie in the sky'.
(..) I have to meet somebody, and I'm already running late. Now, son, I already told you. You're early. Now, tell me if that isn't the best pie you ever ate. It truly is. Well, everything tastes better here. Even the water is sweet. Never gets too hot, too cold, too humid. (..)2003 Big Fish