German mathematician and economist
Carl Wilhelm Friedrich Launhardt (7 April 1832 – 14 May 1918) was a German mathematician and economist.
Launhardt was born in Hannover, the capital of the Kingdom of Hannover. He studied and taught at Hannover's technical school. Following Hannover's annexation by the Kingdom of Prussia, Launhardt served in the Prussian House of Lords.
In 1885 he succeeded in calculating the optimal rate of duties in the sense of the effects of the terms of trade.