Can this be applied to nations? I believe it can.
Much of our former real productive output has been shipped to China, with a "service" economy to replace it.
Like it or not, a strong industrial base with real tangible output provides the heartbeat for a sound economy. "Services" will not cut it.
Cmon now. You know that insurance salesmen, accountants and lawyers are the backbone of any economy.
Behold the fowls of the air: for they sow not, neither do they reap, nor gather into barns; yet your heavenly Father feedeth them. Are ye not much better than they?