In the books, it's indicated that Muggles are in the vast majority, and many wizarding families had reduced considerably due to purebloods marrying their own cousins.
This majority of Muggles must mean that they need to have some control over the wizards, like incarceration (jail), border control, property/land sale and purchase, etc.
Does such control exist, and if so, how is it exercised? Surely governments need to have some control, otherwise there'll be mass panic due to the natural superiority of the wizard.
Note that by control in this case, making a wizard appear to a Muggle as a Muggle.
Edit: Judging from the mixed reactions of people, some seem to think this is a stupid question and that the answer is pretty obvious. I don't think so, really. Some wizards' lack of knowledge of basic Muggle ways of life also doesn't tally up, when its always shown that they live as Muggles in midst of other Muggles, keeping their magic hidden.