Why the Startup of You? Whether you want to learn a new skill or simply be better at the job you were hired to do, it's now your job to train and invest in yourself. Quote from The Startup of You (Revised and Updated) Page p.7
While there are many causes of the development of portfolio careers, the main driver is technological advancement: social networks, remote work, online market-places, and cloud computing, among other innovations. Quote from The Startup of You (Revised and Updated) Page p.17