Throughout his career, Ludwig M. Lachmann theorized about how economies and societies achieve order in an uncertain world full of heterogeneous agents, heterogeneous production factors, and multilayered subjectivity. This article traces how he began his research agenda by expanding the conventional equilibrium framework of the 1930s to include (potentially diverging) expectations but gradually abandoned price coordination as the sole source of order in an economy. Instead, he set out to formulate an institutional theory of socially embedded plan coordination, which transcended the traditional division between commerce and community. This article illustrates this shift in Lachmann's focus by using two of his neglected German publications. Additionally, it lays out how Lachmann's effort in the “thinking in orders” tradition was principally rooted in his dissatisfaction with approaches to economics that reduced it to a “pure logic of choice.” Lachmann instead conceived of his discipline as being something closer to Max Weber's “socioeconomics,” and in this he was strongly influenced by the German historical school. This article explains how, ironically, this tradition, which historically positioned itself in stark opposition to the Austrian school, has—through the mediation of Lachmann—had considerable influence on the recent history of the Austrian school in the United States.