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'.
(..) Sir. Anything you order is free of charge, sir. Why is it free of charge? - Don't ask. - Whatever. I'll have the clam chowder, fried chicken and baked potato and a chocolate chiffon pie. Clean food, please. In that case, may I advise against the clam chowder. No clam chowder. Thank you. (..)1999 Fight Club