Despite common origins, the economy of the Socialist Federal Republic of Yugoslavia (SFRY) was significantly different from the economies of the Soviet Union and other Eastern European socialist states, especially after the Yugoslav-Soviet break-up in 1948. The occupation and liberation struggle in World War II left Yugoslavia's infrastructure devastated. Even the most developed parts of the country were largely rural, and the little industry of the country was largely damaged or destroyed. Post-World War II years The first postwar years saw implementation of Soviet-style five-year plans and reconstruction through massive voluntary work. The countryside was electrified, and heavy industry was developed. The economy was organized as a mixture of a planned socialist economy and a market socialist economy: factories were nationalized, and workers were entitled to a certain share of their profits. Privately owned craft shops could employ up to 4 people per owner. The land was partially nationalized and redistributed, and partially collectivized. Farmer households could own up to of land per person and the excess farmland was owned by co-ops, agricultural companies, or local communities. These could sell and buy land, as well as give it to people in perpetual lease. The exact nature and extent of market socialism in Yugoslavia is debated by economists. The market mechanism was limited mostly to consumer goods, while capital, labor, materials and intermediate goods were allocated by different means. The Yugoslav model didn't have much in common with the classic model of market socialism imagined by Oskar R. Lange. John Roemer, an advocate of market socialism, had a very negative view of the Yugoslav experiment, claiming that Yugoslav companies weren't run on true market principles of competition and profit, and that they instead relied on soft budget constraints and were subjected to political control, which created a deeply inefficient system that ultimately collapsed. While admitting that it is somewhat problematic to use the term market in the context of socialist countries such as Yugoslavia or Hungary (after the introduction of New Economic Mechanism), János Kornai believed that the term market socialism is still appropriate because such countries at least partially experimented with markets under socialism which would otherwise remain only an abstract idea. Youth work actions Youth work actions were organized voluntary labor activities of young people in the Socialist Federal Republic of Yugoslavia. The actions were used to build public infrastructure such as roads, railways, and public buildings, as well