American companies are feeling confident again. Now it's up to President-elect Donald Trump and Congress to get them spending again.

Sentiment from small firms to large manufacturers has rocketed to lofty heights since Trump was elected, mirroring brighter attitudes among consumers. But the true test for the economy lies in the details and how quickly plans for deregulation, tax reform and infrastructure outlays come to fruition — and translate that confidence into investment.

The latest indicator, the National Federation of Independent Business's small-business confidence index, surged in December to the highest level since 2004. Manufacturers and service providers in the Institute for Supply Management's semi-annual forecast also were upbeat about 2017. And consumer sentiment is the strongest since 2004.