A third of American families have ‘roller coaster' finances

``Families that had large fluctuations in their incomes -- even when it was a 25% gain -- were more likely than those with stable incomes to say they wouldn't be able to come up with $2,000 for an unexpected need, according to a study by the Philadelphia-based nonprofit Pew Charitable Trusts released this week. The study looked at "income volatility" among more than 5,600 families the term for a year-over-year change in annual income of 25% or more, between 2014 and 2015.''