If anyone claims that Rasulullah ï·º did not send the mujahideen out to attack caravans as a strategy for undermining the economy of the Quraysh, but rather only as a way to boost the wealth and property of the muhajireen who had lost most or all of what they owned when they left Makkah; you might want to notice that in every single military expedition sent by the Prophet against a caravan, the target was a caravan of the Quraysh, and not any other tribe, though Madinah sat in the middle of the most important trading routes in the region, and caravans from all sorts of places were regularly passing through the area.
Yes, gaining ghanimah was an important element in these operations, but of course it was not the primary objective. This was a clear strategy to hinder the economic power of the Quraysh, and undermine their ability to do business while in a state of conflict with the Muslims.