The prices of most goods and commodities were set by individual governments and had little to do with the goods' actual market values, thus making it difficult for the member states to conduct trade with each other on the basis of relative prices.

How did Comecon cause tension?

Comecon allowed Stalin to control the economies of Eastern Europe for the benefit of Russia. ... The Berlin Blockade was aimed at the Allies leaving Berlin but the Allies were fearful of Stalin making other demands if they did. It strengthened the Allies resolve and brought about NATO which increased tensions further.

Why did the Molotov plan fail?

The plan was in some ways contradictory because while the Soviets were giving aid to Eastern Bloc countries, at the same time they were demanding that countries who were members of the Axis powers pay reparations to the Soviet Union.