Best interest of the economy

Jon Stewart asked Nancy Pelosi how he can get some TARP money, and asked about the allocation rules. She answered:

That is a Treasury Department decision, and that's what's in the best interest of the economy, they tell us.

Now there is a meaningless phrase. Since when does the economy have its own interest? This silly jargon reminds of another meaningless phrase, the best interest of the child, also known as BIOTCH. Nobody knows what that is either.