US manufacturing and services firms expect to see a stronger economy and rising revenue into 2018, according to a semi-annual survey released Monday.

The companies project no let-down after many months of continuous growth, with the upbeat outlook across nearly all industries, the Institute of Supply Management's latest economic forecast showed.

However, worker shortages and facilities operating at very high capacity mean more investment will be needed if the growth is to continue. 

The Republican tax plan currently working its way through Congress could prompt companies to step up their spending, but that will not become apparent until early next year when the details, ISM officials said.