This election season, we've heard Republican and Democratic presidential candidates alike decry international trade deals for sending manufacturing jobs overseas. And candidates have vowed to bring the jobs back. Some factory work is indeed returning from offshore, a movement known as "re-shoring."

Retailers are already planning for the busy holiday shopping season, and there could be a complication this year. As the unemployment rate drops, stores are having a hard time finding workers for their warehouses. They've ordered all kinds of new stuff for the holidays, but it's stuck in a bottleneck.