The United States federal government allocates a staggering $38 billion annually to prop up the meat and dairy industries. These subsidies significantly reduce the price of meat products, including hamburgers. Research from 2015 reveals that these subsidies slash the price of a pound of hamburger meat from $30 to the $5 we see today
Most of the world does indeed eats little to no meat, especially red meat. In the EU, these kind of subsidies also exist.