These are the same thing.
i disagree. Ownership implies legitimacy of means of acquisition. Exercising dominion over an object implies no such legitimacy. Of course in my original statement i was using these ideas interchangeably for lack of a better term and because this philosophical distinction wasnt relievent at the time.
Ownership is legitimate dominion. If you own something, you by definition have dominion over it. You seem to be saying that a market needs only the dominion, not the legitimacy, in order to function. This is false. If legitimacy is not a qualification to trade, then you end up with illegitimately gained items being traded equally with legitimately gained ones, invalidating the legitimacy of the legit goods. In other words, if stolen goods are not classed separately from - and lesser than - legit goods, you ruin the value of the effort of gaining something legitimately, when you can just steal it. A free market requires that property rights - ownership - be respected in order to work properly.