Euromonitor, a research firm, predicts that the world will add 48m new solo residents by 2020, a jump of 20%.

ECONOMIST: Singletons

Solo travel adventurists, get out your paddles and jump in with O.

FORBES: Whitewater Rafting In Bosnia

Solo sends out multiple invoices and trucks, an expensive inefficiency that multiplied with a jump in fuel prices.

FORBES: Party's Over