Scarcity exists as long as we have a body.  You only have one body and can only use it in one way how you see fit.  There will always be conflict unless there are rules for social cooperation.  Property is owned by the first user.  You have ownership over property you first put to use, provided you don’t damage the physical integrity of another’s.  The property becomes yours by “mixing your labor,” to quote John Locke. 

Once you mix your labor with the land it can be said that you homesteaded it.  This is how people originally acquired property.  Property can be contractually traded once it has been taken out of a state of nature.  Different rules of conduct don’t apply to different people.  We are all subject to the rules of conduct for social cooperation.  Conflict will not disappear.  There will always be asocial people.  However, conflict will be minimized.

It’s possible you homesteaded land in one area and gather water in another.  The area where you gather water is homesteaded by another.  Does this mean you can’t gather water from that area now?  Definitely not.  You have an easement.  You are still free to collect water and you can’t be prevented from accessing that water source.  He would be guilty of an aggression if the new owner prevented you from accessing water.

Any aggression against your property can be met with defensive force.  It’s perfectly legitimate in this case.  The owner of property has the right to protect it.  Let’s say you make widgets and the only one in the area.  A new widget maker appears on the market.  This can certainly have an impact on you, but it doesn’t damage the physical integrity of your property.  This might alter evaluations, but it’s not an aggression. 

A solution to social cooperation does exist.  It has existed for a long time.  However, it has been “forgotten” by many today.  The institution of private property must be relearned.  It’s certainly possible that many didn’t forget it, but they simply ignore it.  This could very well be from envy.  Conflicts will be minimized as long as property is recognized.  Any deviation from this institution is always a social loss.

Reference

Hans-Hermann Hoppe; The Great Fiction