When the idea for Master Card was formed, it was owned by a company named Interbank, hence the original logo. When credit became more common, the Interbank logo was shrunk and shoved into the corner of the new ven-digram Master Charge logo. In 1979 the circles were retained but the name was changed to the now familiar MasterCard. In 1990 the colours were made bolder and the "fast transaction" horizontal lines. Par usual, the lines represent speed but they are also used to show the interlocking way interbank does business (giving money to get back some more). In 1996 the MasterCard logo had a new bolder and easier to read font.