The US economy size in 2017 totalled at $18 trillion, covering quarter of world’s economies. China is the world’s second largest economy with total size of $11 trillion or 14.8%. Japan third having total size of $4.4 trillion or 5.9 percent. European countries take the three places on the list: germany at 4th $3.3 trillion, UK 5th with $2.9 trillion and France 6th at $2.4 trillion.