Why are there cargo ships in the Star Trek stories?
With replicator technology and FTL communication, there is no need for cargo ships. You can just transmit the computer files on how to replicate just about any device.
Want your own Triumph motorcycle in your new colony at Procyon-B? Just have somebody back on Earth scan the device, send the files to you by subspace email, and then use your replicator to create an exact copy of the motorcycle.
Want a copy of the Mona Lisa? No problem! Just scan that too. Now you can mount a copy on your bedroom wall. It's picture perfect down to the molecules of paint.
Sending computer files by email sounds so much cheaper and safer than shipping items by freight. The market will go for the cheaper option.