MIT Institute Professor Emeritus Robert M. Solow, a groundbreaking economist whose work on technology and economic growth profoundly influenced the field, and whose ethos of engaged teaching and collegial collaboration deeply shaped MIT’s Department of Economics, died on Thursday. He was 99. Solow’s research, especially a series of papers in the 1950s and 1960s, helped demonstrate at a fundamental level how modern economic growth occurs. As his work shows, technological advances, broadly defined, are responsible for the bulk of modern economic growth, more than simple population growth or capital expansion….