What if you didn’t like some results, so you put in eight times as much effort, and got the same results? Well, welcome to America.
The US prison population has risen eight-fold since 1970, with little impact on crime but at great cost to the taxpayer, researchers say.
Inmate numbers are projected to rise by 192,000 in five years, costing $27.5bn (£13.44bn) to build and run jails… The report said that US crime rates, which have been in decline since the 1990s, are about the same as those for 1973.
Read on at the Beeb.