Efficiency for extracting money from poor people to mega corporations? Seems to me there isn't really a lot of competition left since theres a handful of main players that just buy out smaller competitors.
They actually don't. Water is contaminated at various levels in many places.
They have light and television because of the ordinary working people who work at and maintain electricity plants and design, sell, assemble electrical products.
These things exist despite the billionaire leeches not because of them.