De or het marktverordening?

The correct Dutch article is:

de marktverordening

Rule Words ending in -ing: almost always de. See the rule

How to use marktverordening

the marktverordeningde marktverordening
this marktverordeningdeze marktverordening
that marktverordeningdie marktverordening
our marktverordeningonze marktverordening
your marktverordeningjouw marktverordening
every marktverordeningelke marktverordening
which marktverordening?welke marktverordening?
a big marktverordening / the big marktverordeningeen grote marktverordening, de grote marktverordening