| Used for economic computation | Harvard Mark II Computer |
| Used for economic computation | Wassily Wassilyevich Leontief |
| Start Date | 1949-00-00 |
| Notes | In 1949, Leontief used an early computer at Harvard and data from the U.S. Bureau of Labor Statistics to divide the U.S. economy into 500 sectors. Leontief modeled each sector with a linear equation based on the data and used the computer, the Harvard Mark II, to solve the system, one of the first significant uses of computers for mathematical modeling, |