Making a fortune from a visible card index file system, this former mathema
Making a fortune from a visible card index file system, this former mathematician was able to spend the rest of his life formulating economic theories. He set down the equation which stated that the stock of circulating money times the velocity of its circulation plus the volume of deposited money times the velocity of its circulation equaled the purchasing power of money. He wrote The Nature of Capital and Income and The Theory of Interest. FTP, name the man who pioneered modern investment theory and wrote the commercially successful, How To Live.
Making a fortune from a visible card index file system, this former mathematician was able to spend the rest of his life formulating economic theories.
Irving {Fisher}