Spending on summer vacations has gone down 13% from 2014, and Millennials are reportedly to blame. According to a report by travel insurance company Allianz, 40% of 18-34-year-olds are planning to spend less than $400 on summer travel, thanks in part to non-traditional travel services like Airbnb and Lyft. 60% of Millennials trust sharing services like these, compared to only 37% of other travelers. (Fox Business)