The Soviet Communist Party newspaper Pravda sharply attacked President Carter today, saying he had failed to fulfilled his "demagogic promises" about stimulating the U.S. economy and reducing unemployment.

A commentary by Georgy Ratiani said Carter's program "provides for an insignificant reduction of taxes and for credits to create about 5,000 jobs, which will fill only 6 per cent of the . . . demand for work."

[White House press secretary Jdy Powell said in Washington that the administration has no "fear of a free discussion of ideas no matter how misinformed or ridiculous they might be." He added : "We have long maintained that the Soviet Union has the perfect right to say whatever it pleases."]

Since the Carter administration began to comment on human rights violations in the Soviet Union, the press here has kept up a steady barrage of criticism of U.S. policies. The attacks have become stronger since the Soviets rejected Carter program failed to come to grips adequately with inflation because "the President did not dare to infringe the interests of big companies.

"What is most important is that the President sharply increased arms spending this year, which brings nothing good to the poor people and . . . minorities but which means big gains for the biggest trusts of the military-industrial complex," the article said.

Pravda went on to charge that "having secured, thanks to his demagogic promises, 90 per cent of the Negro votes and won the presidency, J. Carter has geared his economic strategy to meeting the interests of the biggest monopolies, which are well represented in his administration.

The article added that the United States has been able to maintain its economic superiority in the capitalist world only by putting considerable pressure on its allies.

"The United States has retained its superiority although it has an unfavorable trade balance, high unempolyment rates, galloping inflation, under-capacity operation of industries and difficulties in energy supply," Ratiani wrote.

He added : "Never before have the West German and Japanese press displayed such irritation as today over the attempts of the new American administration to resolve its difficulties atsomebody else's expense."