Keynesian economics said the simultaneous increase in inflation and unemployment (stagflation) during the Carter years was not possible as it violated the tenants of the Phillips curve. The standard Keynesian remedy of government stimulus applied to the conditions of stagflation created an inflationary spiral giving the double digit inflation of the late 1970s.
The economic events of the time are well documented in a book, The Commanding Heights: The Battle for the World Economy by Daniel Yergin and Joseph Stanislaw. This book was later made into a three part PBS documentary that is currently available for viewing online. Link
Carter and his economic team attained of level of incompetence that was previously thought impossible.
Now Team Obama is once again redefining how bad a president can be.