Despite the country’s unemployment rate falling below 5% in January for the first time since 2008, and the Federal Reserve’s decision to raise interest rates for the first time since 2006, concerns about wage growth — particularly among middle earners — remain. Since 2010, as the country began to recover from the Great Recession, income of the top 20% of households grew 3.7% from 2010 through 2014. During that time, incomes of the middle 20% of households declined 0.7%.

Based on income earned before taxes by the third quintile — the middle 20% of earners in each state — middle class incomes in Rhode Island declined the most in the country. Incomes among middle class Rhode Island households fell by 3.1% from 2010 to 2014, while income among the state’s fifth quintile, the top 20% of state households, grew by 4.5%. Based on an analysis of household incomes among America’s middle class, these are the states where the middle class is suffering the most.

Consumption is by far the largest component of GDP. Because middle income families typically spend large shares of their income on goods and services, America’s middle class is expected to drive up consumption — and by extension, GDP. […]