The gig economy has exploded in the last few years as more workers embrace side jobs and flexibility of assignments. New studies reveal that this trend should continue into the future. In fact, research group Recode has reported that the number of on-demand workers in the United States alone is expected to nearly double by 2021. That would equal at least 9.2 million Americans working an on-demand job – more Americans than are expected to work in more traditional employment stables such as construction.