The answer is that efficiency innovations are liberating capital, and in the United States this capital is being reinvested into still more efficiency innovations. In contrast, America is generating many fewer empowering innovations than in the past. We need to reset the balance between empowering and efficiency innovations.

The Doctrine of New Finance helped create this situation. The Republican intellectual George F. Gilder taught us that we should husband resources that are scarce and costly, but can waste resources that are abundant and cheap. When the doctrine emerged in stages between the 1930s and the ‘50s, capital was relatively scarce in our economy. So we taught our students how to magnify every dollar put into a company, to get the most revenue and profit per dollar of capital deployed. To measure the efficiency of doing this, we redefined profit not as dollars, yen or renminbi, but as ratios like RONA (return on net assets), ROCE (return on capital employed) and I.R.R. (internal rate of return).

Before these new measures, executives and investors used crude concepts like “tons of cash” to describe profitability. The new measures are fractions and give executives more options: They can innovate to add to the numerator of the RONA ratio, but they can also drive down the denominator by driving assets off the balance sheet — through outsourcing. Both routes drive up RONA and ROCE.

Similarly, I.R.R. gives investors more options. It goes up when the time horizon is short. So instead of investing in empowering innovations that pay off in five to eight years, investors can find higher internal rates of return by investing exclusively in quick wins in sustaining and efficiency innovations.

In a way, this mirrors the microeconomic paradox explored in my book “The Innovator’s Dilemma,” which shows how successful companies can fail by making the “right” decisions in the wrong situations. America today is in a macroeconomic paradox that we might call the capitalist’s dilemma. Executives, investors and analysts are doing what is right, from their perspective and according to what they’ve been taught. Those doctrines were appropriate to the circumstances when first articulated — when capital was scarce.

But we’ve never taught our apprentices that when capital is abundant and certain new skills are scarce, the same rules are the wrong rules. Continuing to measure the efficiency of capital prevents investment in empowering innovations that would create the new growth we need because it would drive down their RONA, ROCE and I.R.R.