Thanks to the work of John Maynard Keynes and of Milton Friedman, we now have a better understanding of how governments can (at least in principle) r… - Martin Feldstein

What is clear is that a French aspiration for equality and a German expectation of hegemony are not consistent.

But further analysis and experience soon raised doubts about the efficacy of these new tools. Empirical research indicated that the Keynesian multiplier was much smaller than earlier analyses had assumed, reduced by a crowding out of interest-sensitive spending caused by an induced increase in the demand for money and by the effect of the larger national debt on long-term interest rates. The leakage of demand through imports and the effect of the fiscal expansion on the exchange rate further reduced the multiplier.

The economic policy issues that we debate today—trade policy, inflation, the proper role of government, the eradication of poverty, and the means of raising the rate of economic growth—have been discussed by economists for more than two centuries. Many of today’s economic policies—both the good ones and the bad—are the result of the ideas of those past economists. And many of today’s debates about economic policy can be understood only by those who have at least some familiarity with the ideas of earlier economists.
The giants of economic science during the past two hundred years have been men concerned with the critical policy issues of their time. They studied the working of the economy in order to advocate better economic policies. But despite their concern with policy, they were not polemicists or politicians but men who sought to persuade their contemporaries in government and in the broader public by analysis and evidence that would meet the standards of professional debate.