If there is an easement for a roadway throught the middle of the property, there could be a negative impact. A title question could be raised if the neighbor's home is partially on the site.

It can add value to the property using the easement but can reduce the value of the property the easement crosses. 

It all depends on whether you are subservient or dominant as to the positive or negative result.

It makes part of your property used by someone else (easement), and encroachement is when someone is using part of your property by extending their property into yours.  A

In a negative way!

Any condition or restriction needs to be assessed for its impact plus or minus

Two different things but depends on what it is being utilized for.

Depends on the property and it depends on the easement. And it depends if the property is being burdened by the easment or benefited by the easement.

Again on encroachments - it depends on the property and depends on the encroachment. Sometimes it's significant sometimes it's not.

Sometimes Negatively.

"Great, I wanted a property with an easement!" Something no buyers ever said. Some will not like it, others won't care but it does thin out the pool of buyers a little. 

I can't say it better than Kenneth J. Jones 

Negatively.

It depends on the type/extent of easement/encroachment. Could be nothing, could be something.

A good way to find out is to build a swimming pool over one.

They have a negative impact.

I wish you all the best with your real estate studies.

Negatively.

negatively. 

Try looking up BUNDLE of Rights

Easements reduce your bundle and are taken or given legally... how much and how much its worth depends on the easement, the property and the buyer.

An encroachment is an illegal infrigment on a property.

It depends. Many properties have easements for utilities. I don't think that most of those have any effect on the property...unless you plan to do something with the part of the property where the easement exists...like put in a pool or another permanent structure.

In general, it depends on the nature and placement of the encroachment or easement.

Depends on the easement. Here's an example of how an easement can destroy a properies value. A family near here bought a 10 acre lot, built a house, and things were fine. A few years later, Dominion Power begins erecting towers for power lines. The easement was already there when people bought lot, but they didn't check. the power lines now go through their property about 15 yards from the house. They will never sell the house for anything close to what it coast them to buy the land and build.

Without a survey delineating the easement or encroachment, hard to say!

It can decrease or add value. 

It depends on the severity of the easement or encroachment. Just had a class on it, and there are many degrees to this overly general question you ask.

Easements are a fact of life.

A lot depends on what the easement, or encroachment, is.  It's also important to find out if the title company is willing to insure over the encroachment.