Even before bitcoin was invented, the British economist John Maynard Keynes developed a technique of calculation the annual interest rate of the crypto currency. According to experts, now it is about 57%. Born June 5, 1883 in English Cambridge, Keynes witnessed a tumultuous period in British history. After passing through the Boer War, both world wars and the world economic depression, he passed away on April 21, 1946. During his life he became famous as one of the world's leading economists. His most famous work is The General Theory of Employment, Interest and Money, which was published in 1936 and became a model for future economic thought.