Answer:human ingenuity
Explanation:
The book: 'The Second Machine Age: Work, Progress, and Prosperity in a Time of Brilliant Technologies' was written in 2014 by Erik Brynjolfsson and Andrew McAfee. This book picks up from their previous book: 'Race Against the Machine'. In this book, they posited that the Second Machine Age involves the use of automation in doing most cognitive tasks which has made humans and software-driven machines substitutes, rather than complements. They contrasted this coming age with what was called the "First Machine Age", or Industrial Revolution , which produced machines for labour.