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Johnstown prospered from skyrocketing demand in the western United States for barbed wire. Twenty years after its founding, the Cambria Works was a huge enterprise sprawling over 60 acres (24 ha) in Johnstown and employing 7,000. It owned 40,000 acres (160 km 2) of valuable mineral lands in a region with a ready supply of iron, coal and limestone.
Supply and demand curve in economics, crossing over at the optimal equilibrium Social science is the study of human behavior and functioning of societies.   It has many disciplines that include, but are not limited to anthropology , economics , history , human geography , political science , psychology , and sociology . 
Johann Gottlieb Fichte (/ ˈ f ɪ x t ə /; German: [ˈjoːhan ˈɡɔtliːp ˈfɪçtə]; 19 May 1762 – 29 January 1814) was a German philosopher who became a founding figure of the philosophical movement known as German idealism, which developed from the theoretical and ethical writings of Immanuel Kant.
The genus Homo evolved from Australopithecus. Though fossils from the transition are scarce, the earliest members of Homo share several key traits with Australopithecus. The earliest record of Homo is the 2.8 million-year-old specimen LD 350-1 from Ethiopia, and the earliest named species are Homo habilis and Homo rudolfensis which evolved by 2.3 million years ago.