If such high-tech, high-productivity-growth firms produce an increasing share of output in the decades ahead, then, one could readily imagine the economy experiencing an overall product price deflation in which the problems associated with a zero constraint on nominal interest rates or nominal wage changes would seldom be binding.
Nevertheless, even if we could ensure significantly more rapid productivity growth than we have seen recently, there are valid reasons for wishing to avoid ongoing declines in the general price level. If increases in both inflation and deflation raise risk premiums and retard growth, it follows that risk premiums are lowest at price stability.