That's how it's supposed to work, finance as essentially the servant of productive industry, increasing liquidity and lubricating the economy. But owners of finance capital, like any capital, want to employ it in the maximally profitable ways, not "just" run a service industry, so also try to get the upper hand where they're in control of markets and the direction of businesses, with owners of productive capital essentially servicing them. Who actually is making decisions is a bit more complex than "a war", but I think there is a constant bit of power struggle, at least, with non-finance businesses wanting finance perform a service role, and finance not wanting to be boxed into one.