There are plans to merge the marketplaces from each game, but reservations from CCP and the EvE community may stall progress.
At gamescom 2012, CCP mentioned the idea during a live gameplay demo. The example they gave would be to earn EvE ship parts down on the planet Dust, and then sell them on the market to EvE players and vice versa.
The community opinion is that CCP should take more time with the integration, start Dust, then see how the world develops. If all goes to plan, then the markets could be integrated as one.