Also, because the state makes labor compulsory and can run enterprises at a loss, full employment is a theoretical possibility even when capital stocks are too low to justify it in a market system. This was an advantage that the USSR arguably realized by 1930,[7] although critics argue that sometimes certain segments of Soviet labor exhibited zero productivity, meaning that though workers were on employment rolls, they essentially sat idle because of capital deficiencies; i.e., there was employed unemployment.[8]