Privatization of government

I have a question: How many departments in our government would function more efficiently if they were handed over to a private firm? What if the issue of simple border patrol was handed over to a company? What if they were given half of our current budget to take care of illegal boats, airplanes, even customs? How efficient would that be? Well, if I were them, I would want to make the most money! That is what a company does! So, I'm going to get the job done while spending the least amount of money, so I can keep the rest and throw a nice Christmas party! What if the government gave them an extra 5% if they did a better job than last year? This would be something akin to a bonus! There could be several companies going after a given section of our border! Competition! Better companies might even offer a lower price to do the job! And for what? 50-55% of the current budget? I think I could be a Presidential Budget Adviser! I just saved 45%! This money could go to the national debt! WOOHOO!