The four articles contained in this issue were submitted independently and at different times to our Journal. They have been independently accepted as a result of the standard refereeing process. We have decided to publish them together, as a quasi-Special Issue, since they all deal in different ways with the thriving subject of market integration. Three articles use price data to explore commodity market integration, focusing on a variety of commodities and using different methodologies. The fourth article broadens the perspective to the market for factors, considering the determinants of internal migrations in Spain.