This collection of essays presents a status quaestionis concerning the dissemination of Flemish and Dutch art during the period 1400-1800, and highlights the role art auctions and dealers have played in this process. Auctions emerged as the primary channel for art sales at the end of the seventeenth century in the Low Countries and during the eighteenth century, countless local art collections were broken up and put up for auction. Old master paintings in particular exchanged hands in great numbers at these public sales, and the finest pieces frequently ended up in foreign holdings. The activities of the professional art dealer form the focus of several essays. These intermediaries played an instrumental role in the commercialization and expansion of the art trade in early modern Europe. They had a profound impact on the history of collecting as they mediated and even influenced taste. Naturally, the role of art dealers changed over time. Therefore, the historians, art historians and economists who contributed to this volume have approached this phenomenon in an interdisciplinary fashion in order to properly understand how art markets functioned. In doing so, these essays explore the various ways in which art dealers helped shape markets for art, and how they facilitated the increasing volume of exports of Netherlandish art from the sixteenth century onwards.