In classical political economy (Smith, Marx, Ricardo), it is human efforts (labour) , which are measured in working hours.
Social Democratic Party of Germany | Social Democratic Party | The Big Bang Theory | social media | production company | The Social Network | Social Democrats | production | Nanyang Technological University | Theory of a Deadman | Social Security Administration | Social Democratic Party (UK) | social democracy | Swedish Social Democratic Party | Social Distortion | music theory | Chinese Academy of Social Sciences | Social Democrat Radical Party | social | Catholic social teaching | Social democracy | Jawaharlal Nehru Technological University, Hyderabad | Faculty of Humanities and Social Sciences, University of Zagreb | Broken Social Scene | Social Security | Social Science Research Council | Production | probability theory | Economic and Social Research Council | theory |