The case of Yugoslavia shows that the Soviet style of socialism was weak.
Under Marshal Tito, Yugoslavia departed to a large degree from the kind of socialism that was dictated by the Soviet Union. His style of socialism was much more oriented towards the market than the Soviet style was. This approach to socialism appeared to work better than the Soviet style did. In the years after 1945, Yugoslavia consistently outperformed the countries that adhered more closely to the Soviet style. Because Yugoslavia prospered even as it departed from the Soviet style, we can infer that Soviet-style socialism was not very strong.