How do I make an inner edge loop parallel to an outer edge loop? For this object I need an inner contour parallel to the outer contour. If I use Extrude (E) and Scale (S), and reduce the outer contour, an inner contour is created. However, this does not run parallel to the outer contour. Instead of moving inward, the contour is moving to the outside. 

Is there a command that creates a uniform inner contour? In the above example I tried the desired one by hand, that is a) inaccurate and b) very time consuming.
Use Shrink/fatten Alt+S with Offset Even option instead:

 

And don't forget apply scale in object mode! (Ctrl+A -> Scale)