It just didn’t seem fair, posting a portrait of Paasche without giving his famous price index-number counterpart Laspeyres the benefit of a quick internet search. Sure enough, two portraits of the good Gießen professor can be found at the link to the Gießen University Archive given below.
Ernst Louis Étienne Laspeyres, a.k.a. Ernst Ludwig Stephan Laspeyres, was born November 28, 1834 in Halle and died August 4, 1913 in Gießen, Germany.
Image Source: Universitätsarchiv, Universität Gießen
P.S. from the same archive, a picture of his grave.
