This chapter provides three microstudies on real-life examples of merchant networks in operation. The first microstudy is the Cairo-based Jewish merchants' network, whose records from the tenth through twelfth centuries were preserved in the Geniza and represents, in its India segments, a simple and thin network. Next is the Armenian network centered in New Julfa from the seventeenth through eighteenth centuries that represents the epitome of the merchant network in its most sophisticated, elaborated, and expanded form. Finally, the Sephardic Jewish network based in Livorno in the eighteenth century that exemplifies the marginalization of the network in the shadow of the corporation. The three microstudies provide a taste of some episodes in the rise and decline of merchant networks.