De or het concessiestelsel?

The correct Dutch article is:

het concessiestelsel

Rule Words ending in -sel: usually het. See the rule

How to use concessiestelsel

the concessiestelselhet concessiestelsel
this concessiestelseldit concessiestelsel
that concessiestelseldat concessiestelsel
our concessiestelselons concessiestelsel
your concessiestelseljouw concessiestelsel
every concessiestelselelk concessiestelsel
which concessiestelsel?welk concessiestelsel?
a big concessiestelsel / the big concessiestelseleen groot concessiestelsel, het grote concessiestelsel